I recently picked up a very nice Player Series P Bass in a lovely butterscotch finish. Weighing in at 8.5lbs the bass is super-resonant and sounds great.
The previous owner had put a white pearl scratchplate on it, but other than that it was stock and in very good condition. However, as an eternal tinkerer, I decided to pimp the bass up and made a few basic modifications:
Hipshot HB7 tuners - much more stable and accurate tuning with these
Hipshot Kickass bridge - a new interpretation of the classic Badass bridge, very impressive!
Dunlop straplocks - these go on all my basses
Fender pickup and scratchplate screws - all changed just to get rid of some rusted screws
Fender thumbrest - I don't use them, but I love how they look on a P bass in the tugbar position
CTS 250k Mojotone vintage taper pots - the original Korean pots were nasty
.047 orange drop capacitor
I did toy with the idea of changing the pickup, but it sounds pretty good so I have left it alone for now.
I'm really pleased with how it's turned out.