bottom line is the NS SF I is the only reissue that has one pickup. That one pickup, to me sounds pretty good, but, if you are going to replace...in this scenario you will only need to buy one new pickup, not a pair. If you wanted to go nuts and do mods like Mgod, Mellow German and Happy Face, those guys might tell you to get a 2-pickup bass. but im not sure how much extra $ id pour into the already signifcant cost of a 2-pickup Korean bass.
It seems I am in the minority, but I prefer single-pickup basses, and guitars, for several reasons- above and beyond only replacing one pickup. But that's just me. I like dual pickup guitars and basses too, just prefer less hardware, less electronics, and less weight; most of the time. also if one pickup is turned off, it is still pulling signal from the strings, you just can't hear it- so what you do hear is technically not the entire string signal from just one pickup, in a 2-pickup scenario (with one turned off). If you just have one pickup, that one pickup "picks up" the entire string signal, every note you play, no matter what. also depending on where your fingers are on the strings (and where the pickup is located) you can get different tones (playing near "where the neck pick up would be if this bass had one" will sound closer to a neck pickup tone...)
if I had a 2-pickup Dearmond SF II bass, I would not rule out putting classic Guild humbuckers or Newark Street "Bisonic Reissues" in there, if there were a need to make any change (or experiment) at all. Bass amps have a come a long way, and those pickups can be made to sound quite good. If you are truly just going for the real thing though, maybe just buy a beat up one from the 60s. They are out there too! I just wouldnt go too nuts (moneywise) on a Korean one. They are worth what they sell for, but dont double your investment swapping pickups on those (unless you are going to swap them back out and have a better use) just my 2 cents. A few years ago those Dearmonds were a hot ticket, but now theres a ton of Korean SF options, new and used, plus the vintage stuff 60s/70s- with a little patience that stuff is attainable as well.
I dont think you will find a bad Guild or Dearmond SF bass (that hasnt been unreasonably abused), just depends on the details of your situation, which will work best...or possibly if any one of them at all will do...and maybe just tweak your amp.
Here is a clip of MellowGerman demoing the Dearmond SF II bass with Dark Star pickups: