While not an expert I will give you my opinion. We are about the same size. I have ridden both machines and I chose the 700r. The 450 does have a superior suspension for racing but I actually like my suspension a little softer. The big reason though was TORQUE. The 450 is really close speed wise but I really have to work the gears to get that speed. On the 700 it comes much easier. I don't race on tracks and mainly ride in the dunes here in Oregon. The 700 has been a perfect fit and if you really like a stiff suspension you can actually mount up the yfz front shocks to your raptor. Just my $.02.

Craig,