For what I consider light fabrication(hobby home building projects), like go kart frames, narrowing car frames(tubbing out cars/pickups) basic broken lawnmower frames etc. you cant hardly go wrong with the new lincoln 140c welder, its a 110-115volt input which means you can take it anywhere to fix something, not everyone will have 230volt plug ins in need of a repair. It will weld .135" or 10 guage steel in a single pass. They sell the 140 in 2 differnt set ups, the 140c has the adjustable voltage output control where as the 140t is the tapped voltage welder, the "c" is alot better because your not relying on a set voltage scale. They run between $600-735. I have used this welder on car frames, rollcages etc. and it works flawlessly, has great penetration and has never hicupped. Just my opinion, a bigger welder is great for big stuff, but you have to decide if the big stuff is what your going to use the welder for 80 percent of the time.
Also, the previous welder to this was the sp135 plus, it is now sold at home depot stores as a weldpak set up, they run like $499, still a good welder but wont weld as thick of material in a single pass as the 140. The 140 is the biggest 110-115 welder out.