My boyfriend is 6'0" and 175 pounds. He needs a mountain bike, but I have no idea where to start with what type to get. He likes to jump around alot...he ended up damaging my trek 4500 by doing some moderate jumping. He wants to go trail riding with me, I have a 04 women's specific specialized rockhopper, it can go fast. Does anyone have any suggestions on a bike that he would be able to ride fast, and jump around on? Oh, and he is on a strict max 450. Thanks a ton!