Dollar wise , it is better to go for the larger unit first. Then if you need the versatility of the 115v units , go for one. I used a HH120 mig for several projects, it works great on sheetmetal repair. The updated version is the HH125. Hobart offers it two different ways, one is flux and one is mig. Get the mig setup, you won't regret it. I now have a new HH187 220v mig welder, a Craftsman(Century)115v mig, just like the one Phil V mentioned, and a Century PowrMig 100. I like the 115v units for versatility, but they don't hold a candle to the newer 220v migs. Lincoln ProMig 175, 175+, the new 180C and the new HH187 are in a class by themselves in this power range. Look in to the Lincoln 175+ or Hobart Handler 187 if you want a truly great value in a midweight mig welder. The HH187 rivals the MM210 in the lower ranges up to 3/16". Northern Tool has them on sale w/free shipping and a $50 gift certificate to boot. They also have the HH125 and HH140 on sale. Merry Christmas.
Too many projects, not enough time .