Choosing a CME Router

I am getting ready to setup a couple of IP phones for the house and configure SIP using flowroute. Currently I have a 1760 with 148/64 WIC-4ESW, a 3620 with 64/16 NM-2FE2W, and a 2621XM with 32/16. Which should I choose?

Here are potential topos:

E4200
|
2940---CME Router
|
3500

I am currently set up with the above but I can't ping any of the sub interfaces on the CME Router (1760).
This is the link to that thread: http://www.techexams.net/forums/ccna-ccent/77241-cant-ping-sub-interfaces.html


E4200
|
CME Router
|
3500
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