IMHO Tig is not the welder to start with. TIG is hands down the most difficult welding method to learn. However, TIG will allow the most flexibility in what kind of metals you can weld. Also, TIG units are about the most exspensive type of welder you can buy.
that being said, I would suggest a MIG. You want one that runs on 220V. you get a better duty cycle that way. My recomendation is the Miller Millermatic 175. Its not too exspensive (around 700 or so) its incredibly flexible, and is a great unit.
92 YJ. High Output 4.0L
Rubicon Express 4" Lift Kit, 2" Body Lift,15x8" AR 767s, 35x12.50 Xterrains, Home Made Snorkel, Sanden OBA, Home made rocker gaurds. 8.8 Rear with Discs, 4.10s F&R, ARB rear, Detroit EZ Locker front, WarnM8000 with Viking Synthetic Line, Beadlocks, Tons of Mods
Score: 682RRv1.0 with a BOA of 13.47
I'm now doing custom bumpers and lift installs in So-cal