Thanks for your advice! In this show-me-the-money world it's refreshing to see people freely offering their advice simply out of their enthusiasm for a subject.
With regards to MHill's comments, I agree, the total cost of ownership is much more than just the power unit. I was disappointed to learn that the argon becomes a significant cost at 20 cf/hr. And stainless and aluminum aren't cheap, either. However, some money can be saved. I have seen posts about using water pumps and 5 gallon buckets of water in place of a $500 Coolmate. I have also thought of renting, but here in St. Louis the only available TIG units from CK Gases
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are Synchrowave Tigrunners for $83 a day, $193 a week or $441 a month. That is a much better option if you have accomplished skills already, and just need the unit occasionally on a few projects. I will be moving to Sacramento, CA in July, and will try to enroll in courses at American River College. They have a course with 36 hours of lecture and 54 hours of lab on GTAW for only $78 dollars tuition. But like playing an instrument, I imagine lessons are best complimented by additional practice at home. It sounds like the Thermal Arc Prowave is the best choice. Unless someone has a used unit in their garage that they might like to sell ;).