Jeff, you're right...the Kurzweil has been sitting idle for too long, displaced by more recent computer-based acquisitions. It's about time I dusted it off and got re-acquainted. It was my workhorse for many years and still holds a lot of tonal goodies for which I have no software equivalents.
And speaking of sampler/synth hybrids, I've also made a conscious decision to dig deeper into Omnisphere. Last night I spent a few hours creating fresh patches with it and exploring some of its more arcane features. But dagnabit, I still struggle to find ways to squeeze Omnisphere into my productions - it sounds so beautiful on its own but really doesn't like to play well with others!
Meanwhile, I'm downloading synth demos like a desperate speed-dater. Diva ate my CPU and then smugly issued an unlady-like belch. Tassman held my interest for awhile, showing itself to be a very deep and versatile instrument. (Still making up my mind about that one. It hasn't seen a major update since 2004.) Synthmaster didn't work right, so I scratched that one. Helix sounded great but may have been abandoned by its developer.
Next up: Chromophone. Not a general-purpose synth, I know, but the audio demos feature a lot of sounds that I can picture using. Anyway, you can't have too many ways to make a bongo!