see http://www.talkbass.com/forum/showthread.php?t=230215 for more info. Would the reverend pups and 500k pots be okay? Would the 500k be too trebely or can the tone control take care of that?
FWIW: Tone is relative to your taste. Too trebly is not going to be an issue with most P's. I've got the Reverend 8.7 and 10K pups and have put them in a bass with 500K volume pot with .0475 mfd cap. Neither pup has issues with excessive treble when moved closer to the bridge by an inch or two let alone in standard position. The difference between a 500K and 250K pot is of minimal significance in my experience.