dom in all honesty your 130 amp mig is going to struggle on anything over about 3mm,if your looking at a good ac/dc tig machine then put the effort into learning that and learn to stick weld properly as most good tig units will do stick as well. you will be amazed the difference that a decent machine with good rods can make.
the biggest problem with small migs is you can lay a weld that may look nice but has stuff all penetration so is basically usless, at least with a stick machine generally if a weld looks good to the eye its going to be pretty strong
personally i use a unimig promig 240 for mig duties and have a couple of small cig inverters for stick work an older weldskill170 and new weldskill 180
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