which TIG welder

you may want to consider a Millermatic 211 with spoolgun. It is not a tig but should weld anything you need. I really am impressed with mine. I reworked my trackhoe bucket and it did a great job. Will weld 3/8" with one pass or 18 gauge. I haven't had time top try the spoolgun with Aluminum yet. Check ebay I think they have a 15% off going on.