Shopping for a TIG

[How2]

Greetings

I'm decent in conventional stick, and gas welding. I know nothing about TIG and want one. I restore motor bikes and to some extent cars (30 yrs). What is a great unit that will weld the thin to moderate gauges of aluminum and steel common to bikes (and car body), particularly to vintage machines? Its not uncommon for me to take the control gauges /switches apart and repair/break them.

There a lot of deals out now, but my knowledge of advantages of machine features for my projects is next to nil. Lengthy details are welcome.

thanks

H2

BTW :I am very open to a used unit. - issues related to such?