I'll just throw in my two cents here since I went through this recently. I second BrandonHall10, get just the new regulator and not a new regulator/motor together. I replaced my failed stock driver's side window regulator/motor with a new unit not long ago. I figured I could get the regulator and motor for about the same price as just the regulator, so why not? Well, what I got (and I imagine all the rest are unless you want to pony up enough to buy a GM OEM part) is a cheap Chinese part. Not too shocking given the price I paid, however, the motor on it was noticeably smaller than the original. After I put it in and tested it by running the window up and down once, the motor was very hot. I didn't notice any binding issues, the motor is just undersized to barely get the job done and I wouldn't have much confidence in it lasting long.
In my limited experience, the regulators on these cars fail way before the motor does. I would absolutely try to keep the stock motor so you don't wind up with some cheap crap. I ended up replacing that Chinese junk with a used regulator and motor from Morad. Once the regulator fails on it, I plan on getting an aftermarket regulator and keeping that motor as long as it'll run.
I just had a similar experience when replacing the blower motor. IMO, try to keep the original stuff going as long as you can since most of the replacement parts are going to be inferior.
