I posted a question earlier. Perhaps it was to complex. Simply. I have a Fender MiM Deluxe Precision. ( Jazz neck - P and Jazz bass passive pickups). I was so pleased by an SD Quarter Pund bass on my regular precision. I want up grade both pickups on my Deluxe. Suggestions please!
Seymour Duncan 1/4 pounders are a good choice. If you want to go active, try EMG's which I love. <a href="http://www.theoremnyc.cjb.net"><img width=385 height=70 src="http://albums.photopoint.com/j/View?u=1174383&a=8647027&p=41535909&Sequence=0&res=high" border=0></a>
One interesting issue in P/J setups is output difference between the P humbucker and the relatively weaker output Jazz pickup. Fender seems to have solved this by overwinding the J pickup in their Hot Rod P-Basses. These are my favourite P/J basses, and you might want to look into a set of those. EMG's are cool too and don't have that output problem either.
I have it in a PJ set in aa Warmoth/79 Fender & it sounds great. The J is a little weaker than the P but the sound of them together is passive magic.