So are you serious, or just teasing us with another idea you've been thinking about??
MIG/gas if you can afford it (instead of the dirtier flux core/gasless cheapo junk).
For most 914 work (up to 1/8"), 110 powered is fine.
You can do the price shopping thing (kinda like buying a buncha cheap clone parts to build a computer), but I think it's worth finding a local shop you trust... the place you would buy gas from anyway... talk to the guys there and get to know them. They'll help you get a decent deal. Miller is a reliable name.