Is there a specific Elektron machine you’re thinking getting sound pack for? Or a specific style/genre?
For the Digitone, I think Haunted Hearts is somewhat of a classic for a dusty/nostalgic vibe. (d)Tones is also excellent if you want to go slightly more experimental, IMO.
If you want samples, there’s a TON of choices for different flavours. I’m probably gonna get the Legowelt Studio (sample) pack for the Rytm now.
For the Analog Four, Movement, Biopads and Elektronos are all pretty nice packs.
Of course there are many third party sound packs for the Elektrons as well but I’ll focus on the “official” ones this time.