Route XP Private Network Services: Cisco ISR 4000 Series routers Comparison Chart : Simple and Quick to choose ( 50 Mbps till 2 Gbps WAN Speed )
Cisco Systems 4500-M Modular Router - Price, Specs
Hardware Installation Guide for Cisco 4000 Series Integrated Services Routers - Overview of the Cisco 4000 Series ISRs [Cisco 4000 Series Integrated Services Routers] - Cisco