Check out the Thermal Arc 181i its a dual voltage 110v or 220v will mig, tig, stick, and even spoolgun ready... They also come with a free Tweco hood voucher and its a pretty good auto darkening helmet.. They run around $850...
I bought a Thermal Arc 211i a few months ago, it cost me like $1300 with the tig torch, and got the free helmet with it.. I really like it, its the most versatile machine I've ever owned..
Unless I am mistaken, the 181i and the 252i are only 220v. The 211i is however dual voltage.
After years of using Miller, Lincoln, etc., and after extensive research, I decided to try the 211i about a year ago. At the time I didn't know much about the brand, but I saw some good reviews and my brother had purchased a 181i and was happy with it. Thermal Arc's parent company is Victor, who also owns Tweco and several other well respected companies. Being an inverter, this machine packs quite a punch into a versatile, portable unit.
I went with the 211i for several reasons, dual voltage capability, small or large spool capacity, lighter weight and more power than comparable machines at a lower cost, digital display with inductance control, etc. I can honestly say that this 3in1 machine has performed better than I ever expected, and I am extremely happy with the investment! The only drawback I have found is that it is DC only which means that if you plan on welding aluminum, you will need to buy a spool gun (I purchased one at the time I got the machine), or feed your addiction like I did and order a Thermal Arc 186 AC Tig! The new 186 is scheduled for delivery tomorrow, and I can't wait to try it out!
That being said, I have used many good machines from Miller and Lincoln, as well as a few others like Hobart and ESAB, and most have performed well. My best recommendation, for what its worth, would be to do research on whatever models fall within your budget and needs, and try to test out the machines first if at all possible.