Choosing CPU for router

[Jon Otterholm]

Hi.

In the process to build a new router and want to choose the best possible
CPU for the job.

Narrowed it down to the following:

Intel Q9650 3,0Ghz
Intel i7-965/975 3,2Ghz/3,33Ghz

What would be the benefit from a Xeon?

Motherboard: Supermicro X8SBI-4LN.
RAM: 4GB

The router will be running IPFW and Dummynet for traffic-shaping. Along with
that, standard services like dhcpd.

Any thoughts appreciated.

BG
//Jon