These cards will go into any of the larger routers.
http://www.cisco.com/en/US/products/hw/routers/ps274/products_data_sheet09186a00800921f0.html
Looking at the limitations it would be nice if you only had 4 sites because you could use a 2800 router. These router do not support things link nm-2w so you can only use the 4 onboard wic slots. You would have to go to a 3825 to have 5 interfaces.
More than likely more cost effective to use a 1 1800 and a 2811 with 4 of these interfaces.
Now if you want to combine the 5 into a single connections that is a function of a DSLAM and I have very little knowledge in that area.