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Two requirements stand out: Media streaming (jellyfin) and multiple hard drives.
In the video front, Jellyfin has documented what you want to look for if you're building "new" (that is, not just using what you have lying about). Discrete video card is very much recommended for tranacoding (which will invariably happen). Check their docs here. They also cover which processor to use and why.
Let's consider drives now: what's the reasoning for multiple drives? I had this requirement too, then had a Dell OptiPlex SFF (Small Form Factor) fall in my lap. Because it can only handle 2 drives (in addition to the M2 OS drive), it made me rethink things. At first I added a 4 port SATA card and four 2.5" drives I had lying around. It worked, but what I realized was my media server needed enough storage to hold my library, but it didn't need internal redundancy. So currently it has an 8TB drive for my library, and an M2 drive for the OS (which is how this machine comes anyway). That drive is duplicated to a NAS and two other drives on different machines (to protect against drive failure).
I run a monthly host OS backup to my NAS, just in case (but it's a simple rebuild as my services/tools run in VM's).
I had a cooling issue at first, then realized it was an old machine (2017), and the cooler paste was likely hard. Cleaned it off and put on new and the fan now runs quietly, even when converting. At idle it hardly makes any noise at all.
One nice thing is it has a relatively small power supply, so it peaks at 80w while converting, and idles about 15w.
It lacks a discrete video card, so when it does transcoding the quality suffers a little. I'll need to upgrade the power supply to add a video card.
I'm really impressed with this little box - I'd buy another in a heartbeat.
I could get by with 2 HD bays -- it is more because I would like to use RAID if possible, and have an easier time to upgrade to larger capabilities as time goes on.
I've also just appreciated larger cases with more room -- with small cases sometimes it's hard to work in there.
Internal redundancy would be nice to have with a file server, but probably not necessary if I can have redundancy with regular backups instead.
Thanks for the ideas!
IMHO for 2 drives you don't want redundancy. (I assume that is what you want RAID for, mirroring?). The per-drive failure rate is so low that you are unlikely to encounter it and nothing you are running seems particularly availability sensitive. Having a bit of downtime to rebuild in the very rare case of a drive failure is fine. The extra storage space is way more valuable.