Looking for pickup/preamp recommendations for my Miller jazz bass

[6stringbassist]

I just bought a new Marcus Miller bass, I love the looks and cool retro style of it, and it's really well made, but I want to improve the rather harsh sound of it, and make it more versatile.
In passive mode at the moment it sounds fine, but still a bit thin sounding, partly because there is no passive tone control, so it's sort of on full all the time.

I'm considering Seymour Duncan Antiquities, or Nordstarnd NJ4's, and either an East, Audere or Nordstrand preamp.

I wondered what peoples experiences are of the above pickups and preamps, and where's the best place to get them from.