CCIE RS Rack Setup

I have been looking around to find some good deals on Cisco equipment to update my old CCIE Rack to CCIE RS version 4. After days of online research and talking to several different folks, I have decided to go with the following upgrade:

1. Replace current 2610/2611/2620 routers with the 2611XM 128M/32M (these will be R1, R2, and R3).
2. Get three Cisco 3725 routers (R4, R5, and R6).
3. Keep the current 3X Cisco 2500 series as backbones.
4. Keep the current 4X 3550 switches with EMI IOS.
5. Keep the current 2610 (already setup as a frame relay switch).

Average price for 2611XM with 128M RAM and 32M Flash is around $130 on Ebay (around $400 for three). As for the 3725's with 256/128 memory configuration, the average is about $200-$225 which is still way better than the $450-$500 price tag of 1841's.