I'm posting this to introduce the Smarter Tools model MMA-200, a 220 volt DC-only SMAW unit that produces very smooth output, has a 100% duty cycle at 115 amps, and is priced very reasonably ($250, with free ground shipping to the Continental US). It's basically like the 80-amp Harbor Freight unit's daddy.
I've been selling them on ebay for several months now, and have enough feedback to feel comfortable introducing them here. Just search for "Smarter Tools IGBT" or seller "richardson-trading".

Or you can buy directly from my online store, saving me ebay fees which I'll pass along to you:


I don't expect people to buy one without having their questions answered, so...ask away!