Maybe you guys can help me out, I am looking for a Switch that is either good enough on its on or has OpenWRT support. I had a look at the OpenWRT site but there arent any options I see that fit my needs...

I'm looking for a well built Router with:

at least 16 gbit ports
2-4 with POE
passively cooled
VLAN (802.1q)

Maybe even a used Cisco one from ebay that fits the criteria?