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A 110 unit will be plenty big enuf. DO get a brand name, they are definitely worth the little bit extra, and DO get a unit with gas. Flux core isn't as user friendly and dirty.
Heminut mentioned the most important thing - using .023" wire. I think you will be fine with a 110v setup with gas.
I actually have used .030 wire with better results. Use the same amperage and a little slower feed rate and I don't have burn through as much. But whatever works best for you.