Willys, Have you tried the HF 1/2" impact wrench they call Earthquake? A buddy of mine just bought one of those things and it is a brute, it has a bunch more torque than my Snap-on and in fact is one of the strongest 1/2" impact wrenches I have ever used. At around $80 on sale(it almost always is) it is a bit pricey for an HF brand but it looks like it is better built than most cheapo air tools. I am going to get one the next time I go by the store
and with what I use my impacts for I will know real soon how well it will hold up.