Well I will pipe in FOR the 110v Miller. I have one and it will tackle a tremendous amount of material. Of course it depends on what you are welding, but it is simple to build up the weld, using MIG, because the bead is clean and there is no prep for the next pass.
I have had my Miller 110v unit on many 20 amp circuits and it has never blown the breaker. Most importantly for me, it goes where I go. If this were a permanently installed welder I would have 220v. With the small Miller, though, I bring it to where I need it. I have run it off of a 12 gauge 50' extension cord and easily welded 1/8 mild steel tubing at the 1/2 amperage setting. (I know I got good penetration because I welded samples for destructive testing and also cut them open.)
If I need to weld 1/4" or larger plate for an extended period I would get a bigger welder, but you can build a tremendous amount of stuff with 1/8" wall. Or like I said, do more than one pass.
I have never had my Miller fail to work in 6 years. I have had some long days of welding but I am always prepping stuff or moving parts around to fix them in the jigs. Without being in a production line setting, I think the duty cycle on the small Miller would work fine. Plus remember that the duty cycle extends as you turn the amperage down and you don't need the amperage on the small Miller all the way up to weld 1/8" wall mild steel.
Like the other poster said, get set up for gas. The flux core could be beneficial, I guess, but it leaves a mess behind.
Now I am saving my pennies for a 110v plasma cutter and you should too!