MILLER - and to a lesser degree Hobat. Lincolns are OK but too pricy for what you get. I worked in a pipe/pressure vessel fab shop in high school and Millers are the only brand that everyone swore by.
For my jeep projects I bought a Millermatic 175. 220V, 30A Mig welder. Enough juice to weld up to 1/4" (with the voltage maxed out mind you). The 110V welders are only good for sheet metal.
I bought mine from www.ramweldingsupply.com They seemed to have some of the better prices and no sales-tax + free shipping. :t: I have done a lot of welding with this welder and it is great little welder.