Hi all, after doing a bit more reading and consulting the checkbook (and the Admiral), I decided to try an inexpensive model:
http://a.co/7EMEgPw. It's an AC Delco 1/2" impact from Amazon. It was only $31. I know it's not in the same category as something like the Ingersoll Rand, but for my modest and occasional uses it was worth the gamble.
I used it on my F150 front end project and it worked really well. It's quite heavy and seems well made. My compressor really isn't an appropriate size for running a lot of air tools, but even so, the impact wrench worked well. If I really get into doing this kind of work, I might need to move up to a higher grade tool, but for now, this does what I need.
Thanks again for everyone's input on this.
Jim