I've been kicking around the idea of a TIG welder for the shop at work. We do quite a bit of fabricating and repairs, at present I have a pretty nice MIG and stick welder. The TIG would allow me to work with aluminum and stainless, but I know absolutely nothing about them. A friend let me do some TIG welding one day in his shop about 30 years ago and I did quite well but I don't know what I should be looking for in a machine. I should point out this would be for occasional use and I probably wouldn't be welding anything much more than 1/4 inch. Any suggestions?