I've got a '97 California P-Bass Special, it came with MIA Fender vintage spec pups that sound great. My only complaint is the output of the bridge pup isn't as loud as the neck, but that may be inherent in P/J sets. Or, maybe not.
I recall seeing on the classifeds a few weeks back a used set of Nordstrands for P/J. I'd assume they would have a nice vintagey sound, but probably wouldn't come cheap. Fralin also does this configuration, usually someone's got them in eBay stores.
If Reverend still has jazz-style pups in the blowout section of their website, you may want to consider getting a set, along with a replacement P. I haven't heard anything negative about them, and you may be able to upgrade your sound with new pups for under $50.
