i'm not a big fan of polaris ATV's, although my buddy has a regular predator w/a little motor work, and it's pretty quick. My stock banshee was nothing but problems, also not very good on gas, not to mention having to mix the gas sucks. i would go with a 400 with some mods or maybe the 450, but dont top it out in the trails for long at all, or you're asking for problems. (buddy just blew his up at Black River Falls) if polaris is yo thing, go with that, i ride a stock 400 ex, and have no problem keeping up tho! Good luck in your search!!!