FWIW, the Lincoln 7018 that Home Depot sells held up really well for several years and I didn't take care of it at all. It is probably the AC variety (don't have the box anymore) and I do live in dry country, so YMMV.
A couple pounds of hardfacing rod is quite handy to have on hand too, just in case you need to slap a wear surface on something.
Penncrest Buzzbox - Infinite amp control! Man the 70's were good.
Everlast Powerplasma 60 - Reliable unit, cuts well.
Everlast i-MIG 250P w/spoolgun - Really smooth, plenty of cajones.
Everlast 250EXT - Worse than a Harbor Freight welder.