The list could go on and on. The real question is, what's not different?
There are of course the obvious differences, such as the gauntlets and the helmet. But there are also lots of subtle things, off the top of my head I can think of the decals and even the hip pouches.
I would check out the Phoenix squadron like Jimmy BufFETT said, but also, just research around. The only differences that people usually base their decisions on are the helmet, the jet pack, and the gauntlets, so you don't really need to worry about the other stuff until you've started.