I bought a Miller 140 w/ autoset about a year and a half ago and I have to say I am really happy with it. In fact my only complaint is that as my welding skills have improved, I wish I had gotten the Miller 180, 220v vs 110v, so I could weld thicker metals and do roll cage work. The 140 cost around $900 when I bought it and has been well worth the price. I can weld anything from 22 gauge up to 1/8 plate without any problems. I used it to replace the frame head and shorten the pan on my buggy and it worked great. Another suggestion is to go ahead and buy a good autodarkening helmet.
My next welder purchase will be a Miller synchrowave Tig. But that is still a few years down the road.
--louis