I've got a 220 mig set up for structural work and a 110 mig set up for smaller jobs like sheet metal and exhaust. It really is the best way to do it or you will be compromising. Another option is a single mig but changing liners and wire size, seemed like a great idea when I tried it but in reality most times I went to grab the mig it had the wrong set up in it, changing over got old quick.
When purchasing a mig (s), staying with the big two names, you can seldom go wrong. Pay special attention if your buying an OEM or made for the big box store version though, considerable difference between them. Watching Kijiji or similar, amazing what pops up from time to time.