Ideal MIG welder set up for body work... What to use? What works best? HELP!

I'd go with the Lincoln 3200 model gas welder running on 115 volts rather than the 220 volt units. You can weld pretty thick stuff with this (1/4 inch no problem) and still have all the portability to take it anywhere without having to find the 220 volt power supply. Ninety percent of most home welding is on 1/8 inch material or less.