i have a thermal arc 185 and love it, pay'd like 1700 for it, its capable of a/c welding as well great machine!! you could get the exact machine from the mac tools cataloge with their name on it for 3800 lol
go to this site join and search for t/a185 or thermal arc or tig welders
http://www.hobartwelders.com/mboard/index.php they have a lot of reviews and it is a well liked machine, they also have other product reviews as well and some kick ass projects
good luck