Hi guys, thanks for the feedback.
Couple of key takeways, and my thought process:
Case: Yes Jonsbo N5 actually seems better. More motherboard support (ie ATX) + More drives, including 2.5 SSD's is actually a perfect fit.
One problem, I can't seem to find many listings for it...
The normal sites I buy tech do not list it (some of them do have the N3 though).
But for my reference they have it here https://www.caseking.de/en/jonsbo-n5-nas-case-e-atx-black/GEJB-157.html (out of stock though)
Uhm ok. I was under the impression that people favored AMD more now-adays, but that was my "looking for Gaming PC" bias probably... (thats another build for another day, for another forum)
So yeah going intel looks the way forward, as indeed jellyfin with possibility to stream (reencoded) videos on the fly is the use case. (although in practice I don't need the reencoding at the monent)
This is why I went with the one stick for upgradability. Going bigger case and ATX might throw this out of the window, as I can imagine myself now getting a 4 slot RAM solution, and putting 2 sticks in, still giving a path forward.
So new (preliminary) spec list (and approx prices, having a quick look around couple of sites, probably can find cheaper if I spend a little bit more time searching)
* Jonsbo N5 NAS case: 220 euros
* Intel® Core i3-12100: 130 euros
* ASUS PRIME B760-PLUS socket 1700 (140 euros, 2 PCI 16 slots, 4 SATA ports, seems to be good enough
* RAM: 2x16GB DDR5-6000 = 32GB: 100 euros
easy upgrade path to 4x16GB = 64GB
I decided not to do 1x32GB for around the same price, having easy upgrade path to 128GB as I really doubt I need that. Even considering the 1GB per 1TB rule.
Even if I reach 128 or more TB (with the 12 possible disks, not impossible), the 1GB per 1TB is probably a good rule of thumb for when you read a lot of data, but when 95+% of the data is rarely accessed I doubt it needs this much of RAM cache
* Boot disk: < 50 euros
* Power supply: Seasonic, or corsair 650W 80Gold plus < 100 euros. -- Not sure how overkill this is? CPU is supposed to be 65W, but 12 spinning hard disks will (theoratically) add some load?
Which brings the total to 740, in budget and with better upgrade path... Although I might need to include the HBA card for extra SATA slots (although realistically I had that cost with my previous plan as well).
Any (obvious) stupid ideas with this plan?