I've had really good luck with the Fender 75 RI Bridge on my P Bass Special. It's a lot heavier and higher quality in all respects than the ones that come stock on the MIM models, and it wasn't too expensive. To be fair, though, it's the one I've only really had experience with, but I love it. Looks the same as the stock one, but made of higher quality materials.
http://www.basspartsresource.com/bri...uinefender.htm
Top row, third one in
