I am new to this sight , and tig welding / welders. am in the market to purchase one in the near future new, or used. and would appreciate any advice you could give.

have only single phase power, looking to weld chrome moly tube (.035 - .188),also would like to be able to weld aluminum 3/16 minimum.

have heard a lot about the new inverter style but wouldnt mind something used. considering our budget
thanks in advance!