Bikesdirect Gravity 29.3.
I just ordered a 29.4 after researching and researching. I wanted something to keep up with my 13 yo son, but not a POS. It seemed to me that BD had some good deals as compared to what I saw from the major retails (Trek, Specialized, Giant). I started to look at some very nice quality frames (Vassago, Niner) but realized I'd be spending $1,500 - $2,000 to build it up nicely. I figure this is a first investment and if I really take to mtn biking, in time I'll upgrade to a nicer bike and this will become a beater.
Full Disclosure - I don't have the bike yet and haven't riden it, so this is all from what I have found on various forums