Cheapest Gateway router for CUCM studies.

What is the cheapest setup that I can use for setting up a Gateway Router for CUCM and CUC. The most I will need is a FXO card with it?
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CUCM SRND 9x/10, UCCX SRND 10x, QOS SRND, SIP Trunking Guide, anything contact center related
A 1760 w/ 64F/160D, PVDM256K-20, VIC-2FXO, VIC-2FXS, VWIC-1MFT-E1 (with loopback plug). Add the 3550-PWR and some 7940/7960's and you're good to go. Not high end gear, but affordable and functional. The 1760 can take VIC and VIC2 cards, but I'm fairly sure it depends on the card variety, check on cisco.com for exact details, some things change between IOS versions as features are added.