http://www.usedvictoria.com/classified-ad/lincoln-Mig-Pak-140-120v-20amp_21166993 here is an example of a welder that should suit your needs. Consider it a minimum. most 110 volt welders are garbage. Both Miller and Lincoln make an ok small welder but they are pushing the limits of what you can do with 110 volts. 220 volts gives a much more stable arc and feed speed is not affected as much when you hit a dirty spot or change positions.(on a 110 volt unit you can hear the wire feed speed go up and down with how much power is being used by the welding process, this makes the weld even worse in bad spots.) 150-200 amps should suit your purposes nicely.
SORRY MAN...just read this ad...
A lot of guys buy this size welder and then get PO'd because it's only 20amp. These smaller welders will limit your ability to weld thicker steel. It will do sheet metal just fine just not 1/4" - 1/2" plate. You can still wire for 220v 20amp would run better than 110v 20amp but know that your not going to do any big steel.
Ok for sheet metal, wiring requirements are much smaller than what I did with mine.
