If you have a TSC near you and have 220 service, I would suggest a Hobart Handler 187. TSC had a sale on them for $549 plus tax a while ago but we talked to one of the managers over the past weekend and they still honored the price. It's a smoking deal for a welder very similiar to a MM 180. 0.023" wire with C25 gas will give great results on sheet metal. They were also about half the price of the local gas supplier when it came to refilling gas cylinders.
Wow, that IS a good deal. I didn't realize anyone had the price of those machines down that far. I would recommend that to anyone as well. Besides having the all the output that most home users would probably ever need, The quality is far and away better than the cheapies. More money, yes, but a much better value.