I looked at the Cisco 800 series. Security is mentioned as a prime selling point on the info page. However it's after the fact.
Heres what I looked for when I made my decision..
#1) Gigabit Ethernet. Both the computer and the NAS have Gigabit ports with jumbo frames so it made no sense to buy a 100Mbps router.
#2) Price. I'm not spending $400+ for a corporate Gigabit router. My usage just didn't justify that, currently.
#3) Heating issues. Alot of the users were reporting over heating issues with the new Linksys stuff and other routers in the 1000Mbs range. So this is something I looked for in the reviews.
#4) Reliability, The DGL-4500 was getting very good reviews from experienced techies and home users a like. That is to say users were not reporting the device to fail after X amount of months.
That's pretty much it. The 4500 has been trouble free after the 1.20NA firmware update. I really didn't consider the security aspect of it because my experience with prior routers lead me to believe that by now all companies producing such a piece of equipment in the $200 range, have got basic security nailed down by now. I was mistaken to make that assumption. I see you said intranet vs internet. That is a yes and no. The DGL 4500 router is behind another "securer" 100Mbs router that feeds it internet. The DGL-4500 services all 1000Mbs ports on the intranet. Port forwarding 443 and soon VPN access are used for remote access. Anyone I invite, mostly friends and family, can access the secure web server on 443 at anytime. While think I minmalized "risk" with this setup, I do not share the point of view, "diverting or ignoring security issues will make them go away". Am I correct in the assumption "every gamer who has a PC has no valuable personal information on it because after all, it just a gamer". No. To say the least of someone accessing another's router with the intent of disruption, all because they got upset over a game or something else. Cost v.s. performance? While the old saying "you get what you pay for" may apply, telling millions of potential customers, "By the way, if your worried about security, then buy another more expensive Gigabit router because our stuff only provides feel good security"; is not a very good selling point. My point in posting was only to bring attention these potential security issues, not to ignore them, nor to start a argument.