Let's try this again. I wasn't able to post my reply after I got done typing it. Had to log-in.
What equipment do you already have? If you have an ac/dc stick welder, all you really need is the torch, tank of argon, and regulator and do like I have been doing the past 15-20 years; using a procedure called scratch-start tig welding. Jody has a very good intro to it on his site "WeldingTipsandTricks.com". But, if you don't have an electric welder, and have to buy one as well as the other parts, it may run you almost as much as a Tig rig. And, of course, with the Tig rig you will want an ac/dc rig so you can weld aluminum. The high-frequency start feature is very seductive to an old "scratch-start dude".
As far as which brand of machine(how much money you have to spend) your chose is personal. The "Red" Lincoln or "Blue" Miller or any of the imported units are very impressive. Good luck.