Better to buy a name-brand... Miller, Lincoln, Hobart, etc... Even Lowe's and Home Depot have decently-priced 220 migs for around six bills.

I use a 220 Miller I bought at a pawn shop for frame and suspension fabrication, with 50/50 Argon and CO2 gas and .035 wire.

My most-used welder is my 110 volt Lincoln mig. The lower amperage settings are great for sheetmetal and exhaust fabrication. I load it with stainless wire and feed it CO2 for my stainless exhausts and stainless fab work. I use 50/50 Argon and CO2 for all other steel alloys.