Replacing Pups on a used Cort fretless ??

I scouted a Cort fretless bass with a P/J slanted pickup config. Black board with minor wear. I want some advice onpickups for growl. Looking to go passive and also want to put a finish on the fretless for a more unique sound. With these factors in mind I wouldnt mind some advice on good pickups and I am willing to spend money for a good product.
P.S. IM pretty familiar with all sorts of electronis and whatnot so a killer active setup is possible to. I want to use this bass for anything.A tonal description with recommendation would be great. Thank you .

I won a spector Czech and SR5 and am looking for more warmth and Zepplin if that helps.

 

Coreection: I own those 2 basses and am looking for something different than EMG's or SR5 sound.