For me, this alone would be reason enough to experiment with upgrades rather than buying a whole new bass. The sky is the limit when it comes to replacement pickups and guts, and the available tonal variety is pretty big. What are you looking for in terms of a core tone? Do you like a clean uncoloured hi-fi sound, or something a bit warmer, or grittier? When you say you want 'tonal variety', does that mean that you'd like to be able to coil tapping options from your new pickups? Single/series/parallel switching? Do you want a 3 band eq again, maybe with sweepable mids?