I bought one like this on TM (not off this guy), and its been really good. Done lots of ali and stainless very good. There are a mulitue of this type of AC/DC Tig MMA plasma units called "200P" - all the same thing made in china in different cases, and there are other models too from the same manufacturer just different specs. It works really well i lke having the pre post flow, foot switch, pulse mode to get those "stack of dimes" looking welds. I ve bought a supergas argon bottle, dont go disposable bottles.
http://ezitoolswelding.co.nz/products/tig-200p-acdc/
The thing ive never had before is the plasma torch.... Mother of TROY thats fun!! its like owning a light saber!!
Ohhh the hours ive spent hack sawing steel in the vice.. eeee ooor eee ooor eee ooor [change hands] eee ooor eee ooor.... now its whisssssssssst, clunk, done.