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Dennis, I have a 110 volt,130 amp Cebora MIG welder purchased in 1988 (!). There was much less choice then. It's ok but not as nice as a Miller or similar pro models, but I get better results with it than I used thru continual learning and common sense upgarages like a very tight and beefy ground clamp. Compared to what I did 20 years ago, i also have a good compressor now, too, which is different but related...being able to knock back or finesse metal with a nice die grinder makes all this stuff easier and better.
As the gent above noted, a good 110v machine is fine for lighter work, and I'll refine that by saying it will be fine for all repair on your 911 unibody. If you were to branch out into heavier work, like fabricating roll cages, or tractor repairs, or frame work on an F-150, then a 220v machine would be the better bet.
A 110v 130 amp machine does not have the same ability as a strong 220v 130 amp machine. Google "welder duty cycle" to understand why. Mine is pretty crap on the highest setting for this reason.
There are pro machines and lesser ones marketed to hobbyists. As jslocum noted, used machines can be a great deal, but with all the sensible caveats about ANYTHING used.
I have access to a neighbor's big, honking, older Miller 220v commercial machine that can be used to weld 3/8" plate together beautifully and quickly. Very satisfying. It can also do very fine work, too. But if I were going to replace my old Italian MIG, I'd likely get a new 110v Miller or similar pro-level machine because they are much better than what I have, but still not designed for heavy duty work mentioned above, because that's not my area of interest, so I don't need the firepower of my neighbor's big Miller.
Hope that helps.
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