I have a Lincoln 100 amp. It's held up well, but the I don't use it much. I keep it set up for MIG (.023 wire) and I just doesn't have the power for anything over thin sheet -- 14ga is pushing it. (That's okay, because I can stick weld anything thicker).
I've seen some pretty impressive welds on thicker stock made with a Millermatic 135 (predecessor to the 140). So it's probably worth the extra expense for one of the 140 amp units Jose listed.
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