[Skunkworks] Cisco routers info

Hey Guys I need to some information, what are the limitations of the cisco 1841 router? In terms of capacity, scaling and expansion. I also need much information on Cisco High end routers and Firewall/VPN devices besides the device product sheet is there anywhere can find this consolidated information? This is due to the expansions Im undertaking so good advice shall come in handy. Themburu -- Conservatism is the adherence to the old tried against the new untried.