Server = ECC RAM and ECC RAM compliant CPUs, ie Xeons in the Intel world. I suspect thats not actually what you want (or probably is, but dont want to pay the cost, or the leccy bill). OOF no longer runs on the HPE Proliants (each server was a single Xeon 2600 V3 series, 224GB RAM, P440 array card, 8 x 1.2TB SAS, 10Gb networking) in order to keep the electric bill under £400 a month...
Branded work better for 24/7 PCs, purely because they are properly considered and designed, rather than a parts bin of shite thrown together, complete with 30 fans trying to cool it. Downside of all desktop CPUs is they can't handle enough RAM for server use. Most top out at 64GB
SATA is shite for server type work, not up to the job. SATA ports are generally a waste of time for anything other than optical drives. Shame, as I have a shed load of 2Tb SSDs
. So don't be swayed with all those crap mobos with 10,000 sata ports and about 3 variants of sata chips and pseudo raid. Universally shite. SATA SSDs are usable for desktops, but a bit crap nowadays.
Windows Server 2022 is the latest version of Windows Server. As always the server licence isn't too bad cost wise, but the CALs are still hefty.