If you've got the time, learn TIG. Not to mention, get good enough and its a good side income for small jobs.
Lincoln Precision TIG 185/225 is a GREAT start, and likely good enough to keep permanently. Can be had for 1400-1800 depending on model/condition, and EASILY sellable for the same if you decide.
Much more versatility and capability, cleaner welds, no spatter all over the place, etc. Capability to weld Steel, Stainless, Aluminum, Magnesium, copper, titanium....
need quite a bit of juice to feed these monsters... 220V, dual 50-60 amp 110 legs minimum. Argon will get you through damn near anything, Helium Mix for a little more heat if need be for thicker Aluminum.