Denalio, thanks for the info on the snow tire model. I don't think either type that you mentioned is available yet in the US, although I found a listing for the Dunlops from a Canadian site for US$382.99 (ouch).
http://www.1010tires.com/tire.asp?ti...trek+WT+M3+ROF
The tire pressure monitor does indeed not require separate wheel sensors. It compares wheel RPM's once the car is exceeding about 25 km/hr. Have you confirmed that using non RFT's is OK on these rims? At the very least, the ride would probably be softer with less stiff sidewalls.