hey just wondering which miller welder i need to buy. i need it mainly for Tig welding mainly S.S. and aluminum. and on occasion Mig i know how to weld just surprised at some of the prices for combination welders and the classifieds are too risky imo cause you never know they might not work properly. i want one with a duty cycle of at least 70-80% if anyone knows a good site with decent prices i would appreciate it. thanks