Scott,
All the information is greatly appreciated! Thanks for taking the time answer my question and educate me on the Thermal Arc stuff. A TIG is no doubt in my future. I just bought another bike, KTM 525 EXC, so it will be a few weeks before I dare add anything else to the garage. But, I really enjoy working with aluminum, as it's easy to cut, grind, etc and it's lighter and certainly more suited for most of my auto/motorcycle needs. I am glad I started with MIG though. It gave me a chance to get started at 1/3 of where a TIG would have put me, plus it seems like a good idea to have both...keep the MIG for faster steel jobs and the TIG for the pretty stuff.