110V limits you to 1/8" but works great with sheet metal. You can weld up to 1/4" if you are able to bevel the joint. I have a Lincoln SP125+, heard many good things about the Miller 135, and I'm sure others will chime in about the Hobart. I would get a unit that works with Argon and steel wire as well as flux core. These are one notch up from the WeldPak 100's in Lowes and Home Depot.