I just put a delco remmy in mine, $130 from advance w/62mm pulley. Double and tripple check which size pulley you need OR get a new alternator WITH the correct pulley for the alternator, if not, it's possible a shop will put whatever size you have on the new alternator and if that's say a 57mm pulley and the new alternator needs a 62, you'll be overdriving the alternator and it could burn it out faster / damage it, alternatively if yours has a 62mm and it's put on a 57mm alternator you could end up with an underdriven / low voltage setup. $305 w/labor isn't bad IMO, that sucker was a PITA even with the stupid access door, I spent 2 long hours fiddling with getting it dropped w/o punching the radiator, otherwise it's an easy job for someone with small hands...
I put the delco remy from advace in mine a few months ago and it has been working great.
It was probably the hardest job to date that I have done to the car, and I have done a lot. It would ALMOST be worth it to pay somebody for the labor, but I can't bring myself to do it.
I have the Delco Remy in and the car works well. It's almost like it has more power, like I can hear the RPMs better. Is the AC supposed to fade out when i throttle to 2500 RPM? It comes back, but it fades away when accelerating mildly and heavily. Is that normal for this car ('96 STS)?
Other than that, it works.
I took it to a cheaper place to save $130. They must have somehow disconnected the parking break, because I have to manually reach down and release it with that curvy metal piece...