The air tools I use;

1/2" impact
3/8" impact, This tool is probably my most used air tool!!
3/8" ratchet
1/4" ratchet
mini die grinder
angle die grinder
air chisel

These are all IR with some Porter Cable and a Husky, but I saved up for them so it was worth the wait. If I was on a budget, I'd get Husky from Home Depot. They have a lifetime warranty. Don't skimp on an impact. My friend bought one from Walmart and it would'nt even remove his lug nuts. Hell my 3/8" impact will do that. Get one that's at least 400 lbs of torque, more if possible.
I still want an air drill and some body air tools. Good luck and start lovin' air. I'm spoiled now <img src="/forums/images/graemlins/kewl.gif" alt="" />.