My friend rides a Kona Stinky and i have to say the thing is great. It is awesome for drops and it holds up to trail riding really well too. Kona makes some sweet bikes. I also have a couple of friends that ride the AC's (AC 3 and the AC 1) They're both pretty sweet too. The AC 3 is a good intro bike for free ride. They are all pretty sweet bikes but if i had to choose i'd go with the Stinky.
Hope that helps. Cheers
