I just bought the Alpha Tig 200 from AHP a couple months ago. Snagged it off Amazon for $720 shipped. It has been fantastic so far. I have used the high dollar Miller Tigs at work, but honestly, this Alpha tig works just the same. It has about all the bells and whistles on it. It gets great reviews online. Highly recommend it for the budget minded guys.
http://www.amazon.com/AHP-AlphaTIG-2.../dp/B00EL8UQH4