the usb3p price wise is almost exactly what a ud3p was when they were available. and DDR3 prices are sometimes better then DDR2 prices.
if your staying with socket 775 i can't see going wrong with the USB3P at all.
check newegg, they have them in stock... if you were closer to S.E. Mi i would suggest going to Microcenter in Madison Heights so you can see the board in person..