What is the smallest welder that would be good for doing structural and sheet? I'm can weld, so that is not a problem. The problem is that I don't have a lot to spend on this but I want to find one that will do everything I want to do with my Blazer. I'm thinking at least a 175 amp. Would I be ok going with a 110 volt, or should I just get a 220 right off the bat and save myself the extra expense later?