Welder for body metal

To me the main reason to get a brand name welder is for support for the welder. It doesn't matter who's name on the machine. If you can't get parts and get them quickly any welder is just a problem waiting to happen.
ESAB, Hobart, Lincoln and Miller all make a good product. Ask to try out the welder before you buy and ask them to weld some sheet metal. You will find one that will fill what you need.