I think I may go ahead and try to assemble a wheel/tire combination based on all the hard work of you guys. I appreciate the help! I visit my parents occasionally and have to drive a long distance through rural east Texas to get there. It would be just like the guy who got the flat in Montana--"What's that tire for? A John Deere?"
Regarding a jack.... I suppose I could always just call for roadside assistance to change the tire, but would prefer to change it myself. Obviously the new 3 series come with RFT and thus no jack or lug wrench. What would you guys recommend for something both cheap and compact that works with the M3?