John,
My new TIG machine just arrived today. I haven't used it yet, but it has a pretty good reputation. I got the Miller Synchrowave 180 SD. I picked this one over the Lincoln 175 Pro for a few reasons. I bought this because I am to the point now where I have to weld some aluminum so the AC with "square wave" technology was important. From the looks of it, I think I will be pretty happy, it has digital readouts for volts and amps, an adjustable post weld flow and it comes very complete (regulator, torch, foot pedal and stick lead). It's got a small "footprint" and only weighs a bit over 200#.
I got it from
www.cyberweld.com and it was almost $500 cheaper than the local shops with free shipping (took about a week). I am not completely sold on the water cooled torch just yet, but I will let you know how that goes. BTW even though the Lincoln was a few bucks cheaper, it didn't come with a balance control and the duty cycle was rated at 25% vs the Millers at 40%.
Pete