I am thinking about adding a new toy to the shop. Specifically a plasma cutter. I want to run 110V at 20A or less. I want to be able to cut 1/4 or more with a clean quick controled motion. I have been thinking about the miller 380 the hobart 600, and the thermal dynamics machine. They seem to be the the best. Anyone ever use one, and any preference or reason to buy one over the other. Also how do the cheap ones rate?