This is an excellent resource!
“The most expert person in the world can only make a router as secure as the firmware (router OS) allows. The following list of security features lets you judge how secure a router can potentially get. This is not a list of things to do to make a router more secure. That list includes a number of actions, like changing the default password, that are common to all routers and thus not in the list below. If you care about securing a router, look for it to have the features below. Sadly, reviews of routers never discuss any of this.” […]
http://routersecurity.org/checklist.php
also:
Firmware Security 