Thanks guys for the input.
David: I am kinda partial to the Miller stuff. I bought an Econotig right after they came out. It feels good and works well even though my TIG skills are for garbage right now. I haven't used a Lincoln for over 30 years, so I can't compare them and Miller except by specs and price.
Nick: I've looked that the little units, but for the type of work I'm going to be doing, they just won't hack it. Working the thicker material and having very low duty cycles at the needed power levels make it a lot of work and frustration. With my current and forseeable work schedule, I only get two or three hours a week in the shop without the 4 year old, so I have to make the most of that time.
I had the same problem with my last air compressor and was continually waiting on it to catch up. I've ended up with a monster two stage on a 120 gallon tank with a 650 gallon secondary tank, so I will have to wait no more.
I buy for quality, with longevity in mind. If it isn't a quality tool, then it won't last and I would have to be replacing or repairing it more that a quality one. As least for me, a cheap initial cost doesn't translate into a cost effective item.