What card should I get to complete my Sam460ex?

I currently have a gfx card, of course, and a wifi card in the other PCI slot. I also have a SATA card I could be using instead of the wifi card but I actually went all on on USB disks because why not so I don't need the SATA at all.

That leaves the little PCIe slot. Nothing's using that at the moment. What can I get to fill that slot? An HD Audio card? Is there anything else worth getting to put in there?

@NinjaCyborg

Depends on what you want to do and what drivers are available.

Possible PCI solutions:
Port expander (gives you more pci slots, if you got the space, or you can lead them outside the case into another one)
NVMe drives (no drivers)
TV Tuner (iirc there are drivers for very old tv tuner cards on aminet)
Video capture (no drivers)

I still have a Catweasel (but no free pci slot to use it) if you are into backwards compatibility and C64 emulation - given you have the SID chips

When it comes to sound cards i would instantly buy a MIDI tone generator supported PCI solution (like the SW1000XG from Yamaha - just, no drivers as well)

LOL well obviously I'm not going to buy something for which there are no drivers.