It is not a wise idea, in my most humble opinion, to buy a MIG, ether flux core or gas, if you don't have an arc welder. Even if you own all the high zoot welding apparatus you'll still need an arc welder. With the wire feed you'll only be able to weld mild steel unless you wish to dump a lot more loot to weld cast iron, stainless steel, hard face, brass rod and some others. A really good cracker box arc welder, 240V. single phase, that will weld all thicknesses of metal will be a LOT cheaper than even the cut rate wire feed. Want to weld sone stainless steel or cast iron? Pick up a few sticks of arc rod of the proper type and go after it.
I have a MIG, a TIG, an arc welder and a plasma cutter. Reciently I purchased the special gas bottle to run stainless steel with the MIG. Not a cheap item and I'll not even mention what the roll of stainless steel wire cost. It cost more than a good 240V. single phase arc welder would cost! I really can't justify buying that stuff because I have the arc welder that will do the same job.
With the huge hunk of capitol saved by buying an arc welder you'll have a good start on an axy/acet. outfit.
When you get the money, at some future time, to buy the MIG buy a good one. But you'll still like your little arc welder hiding under the bench.