whatever you do, get one w/ infinite voltage output not one w/ preset voltage outputs.. i bought a used lincoln pro mig 135 that has 5 preset outputs. when i've used it for sheet metal work on the blazer, i've found that the A setting is often too cold and B burns holes. lincoln also makes a 135 sp version w/ infinite (i think all the new models are 140s?). if i had the sp version i could dial it in much better and save a lot of time and $ on wire and grinding.
i have used it on the regular 15 amp outlets. w/ the lighter settings used in body work and stitch welding, you should be ok, depending on the condition or you electrical system. start welding alot or on thicker stuff w/ higher settings and you will be tripping the breaker. 20 amps is recommended for these machines. i ran a couple 110v, 20 amp outlets in the garage just for this when i put in the 220v for the big welder and plasma cutter.
the 110 v machines are very versatile and handy for the casual user. mine can do up to 1/4" w/ good penetration. they're much cheaper than 220v machines. if you have to put in outlets to handle it, it might be worth it to step right up 220v though.
if i didn't have any welders, my first choice would be the millermatic 211 w/ dual voltage plug. 110 or 220v, infinite output. up to 3/8" and not outrageous $$ at $1100. 110v still requires 20A, but the 220v only needs 25A so a 30A circuit would ok and you could use a clothes dryer outlet.
http://www.millerwelds.com/products/mig/millermatic_211_autoset/millermatic 140 would be nice for 110v
http://www.millerwelds.com/products/mig/millermatic_140_autoset/
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