I bought a Tig welder to do some stainless fabrication. I did a lot of research before buying a Lorch T220 (German) AC/DC, (as I am doing some aluminium stuff as well). The machine is the dogs doodads,it is the upper end in price, but has excellent support and is good value in my books.
LORCH - So geht Schweissen
However, learning to use it is another story. I have been Mig welding for 25+ years but that is a doddle compared to Tig.
I would say the key is in getting all the settings right before you start. Once it is set up to suit what your doing, it is not too bad. I would advise getting on a course somewhere and learn how to do it properly. I am paying a qualified Tig welder to come and teach me on site and I am still crap at it!
It is worth paying attention to how the settings work. I hate menus where one knob and display does 100 different functions. I find I am constantly referring to the handbook as I can't remember where to locate the setting I want. The Lorch is very good and intuitive on this front.
I found this site to be very informative with lots of vids showing what to do.
Welding Tips and Tricks - TIG, MIG, Stick and a pantload of other info