I think I did the opposite of what a few people have mentioned and went sky's the limit with my first SB purchase and plan on going more bare bones for my second. Granted my sky is fairly low, I don't have really extravagant tastes. Getting a birdseye maple fingerboard/headstock, 3TSB, small stainless frets, a detuner and active circuitry was my idea of going fancy. I really want to buy a second SB4000 and go with all standard options, passive, and maybe get it chambered if I'm feeling fancy. My 4000 isn't really that heavy compared to a lot of other basses I've owned, but a little less weight is always nice.
I thought about going with a passive B40 instead of another SB4000, because I really like the neck profile and the J99A pickups more than anything...but the SB4000 body shape is just so cool to me. I know a lot of people have no interest in it right off the bat because of the body shape, but hopefully no one in this thread