if you buy go with Miller i have both the Miller and the Lincoln, the Miller is a much better built welder an if you buy the right Miller you can TIG ,MIG or Stick with it most will even run a spool gun to use aluminum, copper, or stainless in a clean weld as long as you use 100% argon. you can use reg 70/30 or 80/20 gas but your welds will just be black and will require polishing with a wire brush and steel wool. aluminum requires alot of wire speed / feed and mid temp. stainless mid speed and mid temp. copper high speed / feed and low temp. but only buy a Miller. you will thank me later.
here's one of the Millers i have but i like my 15 yr old Miller Pro 485 better
here's the newer of my millers
http://www.millerwelds.com/products/...atic_350_350p/
i have the 350P series.