The other thing to consider about 110 vs. 220 is that the 220 is more efficient -- you end up with lower amps in the circuit. That actually ends up being making the electricity cost cheaper. Depends on how much welding you plan to do as to whether you will notice the difference.

The other thing is that although you can do thicker metals with the 110, it is possible that you don't really have enough heat and are not getting the needed penetration. 220 almost guarantees that you are going to have the penetration.

A lot of the beauty of MIG is using the shielding gas. You get a much cleaner weld that way than using the flux core and I find it a lot easier to weld with the gas than with the flux core wire.

MIG vs. stick really comes down to the range of things that you are working on. If you are mainly doing things like bumpers, rock sliders, and such you probably want stick. If you want to be able to do sheet metal, you want MIG.