I recently just purchased the new power tig 210 EXT thinking that it would be the best band for the buck but since I have made the purchase I'm not sure of I selected the right machine that would be better for me. It was a debate between the 210 ext and the 250 ex. If I'm building stainless steel exhaust systems and aluminum intercooler setups what would be the best machine for me?

Also is it possible to exchange a CK20 torch with the WP26 that comes with the machine?