I have a self-built system for pretty-much this built around a Supermicro board X11SCH-LN4F with Xeon E-2146G. I have 8 drives (not hot-swap) in a ZFS array, plus nvme for the OS, and I use Noctuas all round. Not silent but quiet enough. Idles around 80w and I run a number of containers/VMs on it as well as storage. I went with a low end 4U case with shallow 45cm depth.

The motherboard takes up to 128GB ECC UDIMMS and has 4 ethernet ports (plus a 5th for IPMI) and a good number of SATA ports (I am running 8 drives without additional cards).

I have enterprise rackmount gear as well and my DIY box is in a different league silence-wise (and efficient low-idle CPU wise as well).

If building today, the equivalent current CPU is, I think, E-2246G.

What power strip? Kenable sell individually switched ones for around £35, pulse is the brand. I just bought 3 of them.

Not in a position to try this right now, but if your server is a Dell and you have the (enterprise, possibly) iDRAC, I think you can make a light on the drive caddy blink so you can identify it.

The important digit is the middle one which is the generation and x10 is oldest. Current gen is x60. The x is type with 1 being mist basic 1 CPU box and it goes up from there. Odd numbers tend to be 2u and even 1u but there are exceptions to that. The 0 on the end means Intel, a 5 would be amd.