I have a Hobart Handler 135, which is identical to the Miller 135, and made by Miller. It has the gas conversion kit, no dolly, had gun and cable and some consumables (tips). I paid just over $600, including an auto-darkening good quality helmet/shield, chipping hammer, couple of big rolls of wire (flux core and plain) and a spool gun for aluminum wire (alumimnum wire tends to bend up and bind in the cable, so you feed wire at the gun).

I ran about 50' of learning beads and spot welds, butt and angle welds, and went out and built 4 wrought iron handrails with loose parts (birdcage newels and spindles, 3.4" uchannel top and bottom frame, rail cap, and rail cap returns). It came out really nice (IMHO), but you've got to have a good grinder or two.

I did all that with flux core wire, but I've tried somebody else's gas shield Hobart 135, and it runs a MUCH nicer bead, much cleaner with very little spatter, and seems to get better penetration.

I've welded 3/8" with mine, but I chamfered the edges to thin the meat, and used two passes on the bead. when I cut it apart, I had excellent penetration.

I went with a 120v machine so I could take my 2500w generator and welder into the field. Both sit together in a 3-4sqft footprint (gen uses a vertical shaft motor with spark maker underneath). 135amp is about as big as 120v MIG welders get.

Now if I just had a TIG, and a torch, and a plasma cutter, and one of those nifty tube notchers that uses hole saws, and a 3hp die grinder......