I need to move our ASA 5520 "inside" connections off of an old 3560 switch.  I have three options for the new connections: 1) connect to a 2K (2248).  2) attach directly to our Nexus 7k, OR 3) connect to a 3750X pair (stacked) which connects directly...

Which of the 2900 series routers would provide at least 2-3 times the performance of a 2811?  This router will be used to support connectivity for approximately 65 remote sites that each have a T1 into an MPLS cloud.