Looking to purchase my first tig welder. I have a budget of around $4000 +/- I really want to stay blue, I have had bad experiences with the red equipment, but thats a whole different can of worms. What would you guys recommend? I am needing to weld 3/16" and 1/4" aluminum and some 1/8" steel. It is for my home shop so it doesn't have to be a super high duty cycle machine, but I need something that will have a good penetrating weld on that material. The aluminum is a clutch and flywheel cover for garden tractor pulling so they have to withstand (hopefully not going to have to) but approximately 30lbs of steel and aluminum at 9000rpm if sometheing ever let go and the steel is a frame so it also has to have good welds on it.

Thanks guys,
Richard