sometimes I run a sherman flick on my P.2, I got bored and put a slider on it. I dont ride crazy hard, but I can tell that if I did, that the frame would probably snap. try and find an older P.3 frame, I know they can take the abuse. I craked my 03 P.2 useing a 6" fork. it was craked on like a 10-15 foot drop though. Specialized sent me a new frame. but my friend has a 02 P.3 and it takes the abuse of the 66 just fine. go ahead and put something that has 150 or less travel, probably a Marzocchi drop off triple would be fine. but try and get a sherman flick or firefly, they should hold up to your abuse w/o raking the frame out as much.