Unless you do it for a living or do it alot, M.I.G. is the way to go. Forgiving, easy to learn, good for out-of-position welding. Go with a gas system verses flux core. I bought a used HTP 140 a few years back. Runs off of 110, has pause and weld time controls ( stitch welding ) and can easily weld up to 1/4". Makes an amateur ( that would be me ) look good.