Maybe start with what you need.
From your setup I’d say a synth that does chords could be something interesting.
8 or even 6 voices is comfortable, 4 less so but still works, keeping it minimal.
The commentary you make on the sound would let me think you would rather go for an analog (or virtual analog) synth.
As for onboard Elektron sequencer or not, I personally prefer it as you can go deep in plocks/sound locks. Besides you don’t have to hook another piece of gear to play with it outside the studio. But yes, Elektron sequencer on other synths can be fun
Digitone is very capable, both for sweet and harsh sounds. Yours to say if you like them: the palette is very large as any FM synth but you’ll have to think differently to reach your goals.
A4 could be a good choice. Plenty of options, years of discoveries ahead. Needs some dedication but very rewarding once you’ve given it the time it needs.
Or a simple Micromonsta2, bitimbral / 12 voices / cheap / small footprint / ace sounding. Quick enough to tweak, not that full of knobs but there’s the minimum required for a good experience.
Novation Peak is frankly impressive. Maybe a bit too large, but check it. Really really cool synth, with incredible possibilities, can be found rather cheap second hand.
OB-6 is a beauty, module (+ Keystep37?) gets you above the 2k€ though. A bit large as well. Every time I switch it on I get lost.