Right now, you can find Gigabyte MJ11-EC1 (mini-ITX, embedded EPYC, 8 SATA, 1 GbE) and MC12-LE0 (micro-ATX, AM4 Ryzen, 6 SATA, x16+x4 slots) boards for 100€ or less.
For 8 SATA and 10 GbE, AsRock Rack E3C246D4U2-2T are readiliy available from eBay (micro-ATX, LGA1151-2 the last Intel socket with ECC-enabled Core i3).
I thoroughly hate Silverstone designs, their many tiny screws and countless design flaws.
There’s some discussion about NAS cases here:
Unfortunately, the Inter-Tech NAS-8 turned out to have some design flaws as well:
I’m not making any recommendation. You need to narrow it down somewhat on explicit requirements (CPU power, number of drives) and implicit requirements (size, noise, pool layout and how it’s going to eveolve…).