| I own a 55-01 upgraded and let me just say, any upgrades to the electronics are FANTASTIC!!!
The way you described your tones that you like, it sounds like better Bartolini pickups would be your choice. Personally, I don't love the Bart sound, but the basses you mentioned use them almost exclusively.
Look at what they offer in the P2 size and you can just drop them in, no routing necessary.
Nordstrands will change the tone completely. They are more of a vibrant, jazz-ish tone. I'm not well versed on their Dual Coils, but I have the Big Splits and they are like a super-awesome Jazz bass pickup. They don't have the warm, fuzzy humbucker tone. They snap.
As for preamp, just about anything can be an improvement. I liked my Aguilar because it was cheap, modifiable, and had a lot of oomph. But if you are more of a Tobias/MTD guy, maybe a Bart preamp.
If you like the way the pickups sound (maybe start with those, before the pre), you can go with Audere and it will allow a lot of the natural characteristics to come through.
If you want an amazingly versatile preamp and don't care about the price, go with an East U-Retro Deluxe.
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