Hi guys. My name is Brian and this is my first time posting in the mountain bike forum. I'm a roadie for gods sake! Don't tell anyone... . .. I went mountain biking for the first time a couple of months ago and.. and.. I've decided to put together a mountain bike.. Secretly, I respect you and your sport, and I mostly despise my snobby elitest roadie peers. Please impart your wisdom on to me! I am in dire need.

The bike thus far
20" hardtail aluminum frame
sram x0 shifters, rear and front derailuers.
avid SL-V brakes
avid SD-SL brake levers
FSA Carbon riser bar
Generic carbon seat post
Stronglite Cranks
On One Stem

I haven't decided on a wheel set, but i'm probably going to build up some xt hubs on a sun rim. I'd love to hear wheel suggestions, since I know very little regarding the products.

Most importantly, is my need for a fork. My budget is around 350. Should I buy new, or look for a fox fork on e-bay? I know very little about the quality of various forks on the market, but I'm overwelmingly told that Fox are very nice, and everything else for the most part sucks. Now I know that's a silly generalization, so please advise!

Thanks guys.