10 Amps should be low enough to do the thin stuff. On really thin stuff you can back it with a piece of copper or use a smaller dia tungsten or move faster. It will take some practice no doubt.
There are not alot of mid range options.
The Miller Dynasty DX 280 with a small water cooled torch and wire less foot control is the versatility standard that all are measured. It will do anything you need.
$7000.00 Is a pretty big investment
Miller Dynasty 280 DX Complete With Foot Control 951468