which TIG welder

been looking at HTP's mig,tig and stick welder. the smaller versions do not seem to be as efficient as the larger one.so who has one they use and really like?off the top of my head,1/8" would be the thickest I'd be using but it never hurts to have a little more amperage in reserve...at least that's my way of thinking.used would be nice but I'm concentrating on new unless someone is willing me one!