If you don't need the 2 SFP ports I think the BPI-R4 PoE version would be better, I'm not really sure.
Here Banana Pi sells the regular version of the BPI-R4 with two SFP ports in a complete set with all accessories together (including the WiFi 7 module + antennas, but you need to buy a better power supply), no need to buy them separately (less shipping cost):
On the Banana Pi forum they recommend buying a better power supply than the one sold by Banana Pi for the BPI-R4:
If serious fan noise isn't an issue for you, and you can live without fast wifi (or outsource it), there's the Dell Edge 680 - https://www.ebay.de/itm/226214736858
Seller will probably accept offers in the 200€ area, perhaps even less.