Since the inception of this thread, I've taken a job at a local GM dealership as a Quick Service Tech as well as an Apprentice for two hours a day. I've purchased a 1/2" impact and a small set of impact sockets that have the most common lug nut sizes, a tire inflator with a gauge on it, a set of torque sticks, a 1/2" torque wrench, a couple of cup sockets and an oil filter wrench from a garage sale, a set of Torx screwdrivers, and a digital air pressure gauge.
I still need things like an Ecotec socket, but I'll get that from Matco later this week. I'm going to be financing a small amount of tools at a time and paying them off to help my credit score. I think aside from a few specialty tools, I'm pretty set. Any advice or anything you think I'm missing?