Yeah, the more I look into it, the more it looks like a 1000, what with the Suntour Cyclone derailleur, SR Apex crankset, and cantilever brakes. I'm thinking it's actually a 1980, as what I thought was a T is more likely to be an I (the bottom of the die that stamped the serial number didn't stamp the bottom 1/8th of it, but there's no curve so as to suggest it's actually a J prefix). I went over it after I got it back from the shop, and it's not in as dirty/rusty condition as I thought. I think I'm gonna do some research on basic tune-up stuff, get my hands on some tools and start tweaking, since I found a few issues.
*Weird creak in the cranks when I put a lot of pressure on them...based on my meager experience it sounds a lot like a loose bolt, but I'll probably...
*Rebuild the bottom bracket (or have it rebuilt)
*Find a new seat (somethin classy)
*Retape the handlebars with something less garish (probably once that cloth tape wears out)
*Get the wheels trued
*Replace the pedals (classy again)

So, it looks like the more I research this, the better the deal it looks like I got! I'm a pretty happy dude right now!