I was also thinking of a TRX250R modded engine but why would I spend $2,000 on a engine when I can buy an R for that??? And the only reason I'm staying away from the CR500 is because of the PITA it is to get it counter balanced and it will still vibrate more than most. And they are insanely expensive. Quadzilla is out of the question due to price. CR250 is a good possiblity. The thing I thought would be cool is being able to take Honda's most recent technology and putting it together to make, basically a new generation TRX250R. I'd like to stick to Honda with bike motors. I looked into XR650R engines and they are outrageously expensive. I'd like liquid cooled. Banshee wouldn't be a bad idea simply because of the aftermarket support and besides, duals look mean! I:I and really, for XC and MX you don't need much power to get there as long as suspension is up to date. I think the Banshee would be a VERY competitive MX'er if the chassis was even somewhat decent. But they built them like a brick. I'm amazed no one said "Slap a Blaster motor in there!"