I would stay clear of direct drive, second hand, anyway. If something goes wrong with the electronics, you're buggered! At least rubber band drives and idlers are easy to fix.
This is a consideration, but I have 2 motors, and both of them work great. They're not quite the same (one is quartz referenced, the other uses an RC oscillator with pitch adjustment), but they're interchangeable. Plus, the info in the Pioneer service manual is pretty detailed about the theory of operation. I expect I can do at least some rudimentary troubleshooting. If the ICs go out, though, you're right, I'm hosed, since there's basically no chance of finding Pioneer proprietary ICs, even on ebay.
One key I discovered is the motor really needs the platter it was designed for, or at least one with nearly the same angular momentum. I started at first with a lightweight platter, and it almost worked, but I could see the PLL cycle-slipping both on an o-scope and by looking at the strobe marks. I added some quarters around the edges, at which point it locked right up. So, I found the proper platter on ebay, and now it looks great. Based on my o-scope measurement, I'm getting much better than the rated 0.025% W/F.
Of course, I'm sure there are those who would discount this measurement since the o-scope is a digital scope (oh the horror!!!).