I know jack about welding, but I have a co-worker who has been doing automotive welding for 40 years, and when I showed him the Millermatic 135 I was considering, he said it look like a good product and a good deal. He uses a high end Snap-On unit, but likes many features of the Miller, specifically the "INFINITE VOLTAGE CONTROL with WIRE FEED SPEED TRACKING," and "STANDARD BUILT-IN SOLID STATE CONTACTOR CIRCUIT."
Millermatic 135 with Cart and 60 Cu Ft Cylinder (free shipping) $735.00 (eBay stores)