As a high school cross country racer, I'm gonna have to go with the cross country 29er.

Easily the best combination of ride and speed for any local trails. People argue that a 26er is more nimble, but I'm a mere 125pounds and whip around my 29er on a regular basis.

If you need more convincing, hit me up. I just need to sleep right now - so much schoolwork. My brain is fried.

Oh and if you want to keep it under 2k, there are far better options out there but they require piecing this puppy together and hunting for deals. It's the route I'd take. Stock bikes...lame.