What TIG gas?

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All, At the moment I have a DC TIG machine. I am looking to upgrade (hopefully by spring time) to a nicer machine that does AC also. Does anyone have any recommendations for gas? Since the current machine is DC-only it is only good for, basically, steels. My intent with upgrading to an AC machine is to have a capable machine for welding aluminum specifically. Any other metals (besides steels and aluminums) would have to be analyzed on a case-by-case basis, but my goal is to have at-the-ready both types of metals covered. Is there a gas I can get that will be good for steel that may get me started on aluminum at the point I acquire an AC machine? Or am I going to need to dedicate 100% one gas for steel and 100% another gas for aluminum? Also - bottle size. The DC machine is small (Everlast PowerArc 210STL) and it rides in the truck all the time as a stick machine. I am not sure having it as a portable tig is really in the cards, but it is possible I may travel with that capability at some point.The upgrade to the AC machine would be on a regular shop cart so bottle size there won't quite matter (as in necessitating a smaller one). I guess it comes down to usage and cost.Thoughts?
Reply:For TIG A/C or DC 100% Argon. Albeit some people mix helium on A/C but to start just use 100% argon.www.tjsperformance.comDynasty 300 DXHTP 240HTP Microcut 380Hyperthem 85JD2 Hyd Bender and HF Hyd Ring Roller all in one =(Frankenbender)Bpt. Mill/DRO4' x 8' CNC Plasma TableInstagram: tjsperformanceYT: TJS Welding and Fabrication
Reply:Yup, simple as that.  Just plain argon.

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Reply:One gas to rule them all...Argon.Miller Multimatic 255
Reply:Well I personally wound use 100% argon, but that's me Sent from my fab shop using a mig welder and a grinder

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