I gotta agree with JD, the Super 55's are damn good. Personally, what I feel sets them apart from other humbucking Jazz pups is how "beefy" they are. Not muddy, but definitely rich in the low-frequency department. Another possibility, assuming they can be found at all, is Fender's Samarium Cobalt Noiseless (SCN) pickups which preceded the aforementioned Super 55's. I'd say they're closer to the modern Jazz pup sound, if that's what you're looking for.