Thanks for the feedback and link edits.

BTW:
Small correction on PC configuration.
I use HDPLEX NanoATX 80W which makes BOM cost 15 $ less.
So, in total system HW cost are around 757 $

Thanks
W.S.

I wanted to build PC that -is silent (without any moving parts) -is "enough powerful" -shall have direct AC input as power supply (no external AC/DC converter) -shall have dual Ethernet connection (as "networking" device) -Wi-Fi /BT -"compact in size" My intention was not to build passive cooled hig...