Hey Kevin,
I bought a small Tig a little over two years ago. Me decision was between the Miller 180SD and the Lincoln Squarewave 175 Pro. I really wanted the Miller, but got a killer deal on the Lincoln I could not pass up ($1250, free shipping to my door).
I have used this machine for two years now and found it to be an excellent machine. The machine is much better than my Tig skills, but there improving with each project I tackle.
I think your gonna be quite pleased with the 180SD...perfect size for the home/race shop.
HTH
Todd
http://www.malibumotorsports.cjb.net