I want to start learning to tig weld at home just for a hobby. I currently use a Lincoln SP-135 mig and an old Lincoln Weldan Power AC-150 stick. My main use would be mild steel and aluminum under 1/4 inch thickness. I also would like it to be portable. I've read through the spec sheets on both machines. I'm just not sure if it would be a smart move going for the more expensive machine with all the different settings or to start out with a more basic machine then work up to the high end machine.

Thank you for your assistance.