Ah, the skates - another aspect of goaltending made more difficult than it should be.
You have arrived at absolutely the right conclusion: sharp skates are the closest thing to a necessity for contemporary goalies apart from first-rate head, chest and crotch protection.
More importantly, it sounds like you and your son each came away from that with knowledge more valuable about his own character. But on to the skates...
The 'conventional wisdom' -- which originated in the years when the rules prevented goalie from dropping to their knees except by accident or in prayer (I'm not kidding) -- is that goalies should have skates that offered as little resistance as possible to shuffling, that is, moving perpendicular to the lead skate-blade without lifting it. This lead to things like flat-cuts (cross-grinding a goalie's skate blades totally flat) and cross-cutting (where lateral channels were actually carved into the blades) and goalies sharpening their skates once a year. At the same time, the profile of goalie skates was as close to flat as possible in order to provide a long, stable base that counteracted the lack of hollow edge. Even up to the last generation of Tacks goalie skates, CCM put a 100-foot profile on their goalie blades, which is a radius of a circle so huge that several people could comfortably play hackey-sack on top of it.
Most contemporary goalie coaches will advise starting at a 1/2" hollow and adjusting from there in 1/8" and finally in 1/16" measures. I've gradually settled into a 7/16" hollow, down from 1 1/4" in my playing days. A deeper hollow does indeed make lateral shuffling more arduous. That said, with improved technique and leg strength I find that I can still get a good 2-3 feet of lateral glide out of one push if I need it. (NB that I haven't yet tried the new Blackstone FBV sharpening on my skates, but I hope to as soon as my LHS gets the machine.) Where your son likes his hollow is strictly personal preference. I know one lunatic who gets his done at 1/16" (as deep as a machine will go) and has actually reached the physical limit of shuffling: he has to make little side-to-side hops.
This deeper hollow is generally paired with a much shorter profile, ranging from 30 feet (RBK, CCM, Bauer) to 22 feet (Graf). I'm on a 30' profile myself, chiefly because I like the stability and power of the longer blade. Again, it's all down to preference, but your son may very well prefer a shorter profile since he's coming from player skates (which are probably in the 9'-11' range).
As to the differences in goalie and player skates, the profile is the major one in terms of feel; combine that with the fact that goalie blades are longer than player blades at the same boot-size, slightly but noticeably thinner, and that the cowling places the boot much closer to the ice than the taller holder of a player skate, and you can understand why so few people switch easily from one to the other. As you rightly observe, his player skates keep the blade on the ice at a lower angle than goalie skates because the blade sits higher and the skate is narrower.
The boots of goalie skates are another matter entirely. As you've observed, they usually come up shorter on the ankle. In addition, goalie skates traditionally remove the tall tendon-guard of player skates, and replace the upper part of the back of the ankle with a soft, flexible material. The point of this was to allow for a greater range of *backward* flex at the ankle required by the old repertoire of skate-saves. It basically serves no purpose now.
There are a couple of ways to compromise here.
Out of absolute necessity, I have experimented with using player boots in goalie cowlings (Flexlites in RBK's). It is the only combination I will use, but it's totally impractical. For one thing, it took me ages to make it work, and it was a painful process not just in terms of finding out what worked but even in building the final version. For another, I have only ever found one shop in Toronto that would attempt it at any cost. So it's either an enormous waste of time and/or money to get something that may not work in the end. If you happen to know an absolutely brilliant skate technician who's willing to give it a try, go for it, but it won't be cheap even if he gets it sorted much faster than a rank amateur like myself.
It is also entirely acceptable for your son to continue using his player skates in goal. At his age, as long as he doesn't face older shooters in shinny and his toes aren't crammed to the toe-caps, the risks are few. If the skates do get too small and his toes press to the end, and he takes a hard enough shot, he could badly bruise or even break a few of the nails or bones. If he takes a hard shot to the holders (unless they're Graf or ICM) they could break; a good shot could also snap the blade itself.
Moving to goalie skates is primarily an issue of protection and durability. Secondarily, it is an issue of performance, since at some point the adjustment will need to be made. Lastly, it can also be an issue of 'image' to slightly dimmer minds. So people don't take a goalie seriously unless he's wearing goalie skates. This not only applies to goalies but goalie coaches; some parents won't give a goalie coach wearing player skates the time of day simply because the image 'doesn't work for them.' This is the same absurd bias that forces kids into horribly unprotective masks that do nothing but look like 'big kid' masks, when they'd be safer in their old helmet and cage.
The Grafs your son used were ideal because the short profile (22') is closer to what he used in player skates. Had they been sharpened to a deeper hollow, he might have loved them. That said, you are absolutely right when you observe that the wider plastic toe of the cowling made him slip out more often and more spectacularly. The previous generation of the Graf cowling was actually nicknamed the 'Elf Toe' because the design was so egregious. In theory, it made the toe of the skate more protective and helped lift pads with a deeper boot-channel away from the skate to allow for easier rotation; in reality, they were just a pain in the ass. Graf has since made a non-Elf cowling that less resembles a pair of ice-dancing clogs.
My honest advice would be to let your son keep using his player skates in goal UNLESS they're starting to get small on him. Let him compare that experience to using the Grafs with a hollow that matches his player skates. Since the blade on the goalie skates is thicker, you'll want to go about 1/16" to 1/8" shallower than on the player skates to keep the same feel -- if the player skates at at 1/2", go to 9/16" or 5/8" on the goalie skates. If he has a preference between the two skates after some comparison (and the one he had today was IDEAL), let him go with it. As soon as you feel he's starting to outgrow his skates or he starts facing older and better shooters, get him a pair of goalie skates. Used will be just fine. Look for CCM Vector 6.0's, RBK 5K's, Bauer Supremes and Grafs. The Bauer Vapors were an unqualified disaster. Make sure he tries them all one, too -- goalie skates DO NOT fit the same as player skates in the same brand and line, with the sole exception of Grafs, which are built on the 705 last. You can always have the goalie skates profiled closer to his player profile. It's impossible to get a 9' profile on a goalie skate, but you can certainly find a happy medium to ease the transition.
Hope that helps!
This post has been edited by Law Goalie: 19 July 2009 - 05:48 PM