I spent last week at the SEMA show in vegas and had a little time to stop by the Lincoln and the Miller booths. I looked at the Precsion tig 225 adn the Miller Diversion 180 . The inverter is interesting as I can use the power I have in the garage, 220 50 amp. Is the Miller enough machine for a part time rod builder? I do alot of sheet metal work and occasional chassis work. Very little Aluminum but that's prbably cause I don't have that capability currently. Which machine should I buy?