Entry-level "server", whether to take second-hand, whether to pursue ECC memory?

Question

Iron

Given: a small company with less than twenty employees is thinking of buying a server and asking for help. At the moment there is no server there and apparently there was not before. In any case, the server is planned in the usual tower form factor (there is no rack). memory 16-32 GB, 2 network cards (integrated or not - it doesn't matter), 2 sata disks in raid 1, sata disk for fresh backups.
Planned tasks: terminal server (one of the main reasons for the purchase), dhcp (now the router distributes settings), Internet access control, mail, AD (now all accounts are local), a site with dozens of visitors a day, maybe 1s (now file, 1 pcs), possibly IP PBX. OS most likely Windows Server Essentials. There are no plans to expand for at least the next year. The budget is not exactly defined, in the region of 50-90 thousand rubles. for everything, payment is strictly by bank transfer, so aliexpress is no longer needed.
Questions:
1) Is it worth contacting used servers? If yes, on what platform? 1155 first-second generation? Or does it make sense to take even more ancient ones for 1366?
2) If not used - what about non-server platforms like Ryzen 5 1600 or Ryzen 7 1700x on B350-X370? Do they have support for ECC memory (it is for me now the main factor in favor of xeon)? I found quite a few discussions of ECC support, but I have never seen statements like "I have a home file washer on Ryzen, ECC works."

Answer 1

Look in the direction of HP MicroServer.
There is a large selection of processors. You can separately take a good BU processor at shop.nag.ru + ecc opera.
Under the terminalka 1C, take only ssd. Otherwise, you'll end up in a queue.

Answer 2

Good afternoon!
1. There is a sense. It makes sense to pay attention to the used supplier. 1155 in my opinion there is no contact with 1366.
2. I think new systems simply won't fit in your budget.
IMHO 90 tyr is not enough - the terminal cannot be lifted on Essentiales. :(