You'll be fine with a 10" saw, in the end it'll probably save you a good bit of money on blades (and 10" saws are usually cheaper) You may also want to factor in portability because you may find it nice to be light enough that you can take to competition just in case. Some teams like to have a small arsenal of machinery just in case something needs to be fixed. Generally you'll see drill presses, vertical band saws, once in awhile a sander and miter saw if not a circular or reciprocating saw.
There are a few brands that you can look at especially since you want to cut metal,
DeWalt,
Hitachi, and my personal favorite,
Makita. Some other makers you might want to look at, but I would be a little questionable about as I haven't used them much are
Bosch (Drill motors woot!), Porter Cable, and
Rigid, as a word of advice, stay away from Craftsman, Black and Decker, and any other company you haven't heard of before that makes power tools There are other companies out there that produce great working hand saws, but these companies (particularly Makita and DeWalt) build them to take a beating.
Good luck with your search, hope you have fun!