maczen,
I will echo what I have said before - when I was at Cisco Networkers in San Diego several years back, I did the security tract and all the Cisco Security CCIEs kept stressing that in order to secure a network - you need to know as much as possible about networking.
When asked about Security + they felt people doing this should be at least a CCNA but felt the higher the level of security - the more the person should know about networking in general. All of them were R & S CCIEs as well as Security CCIEs, they all had been CCNPs.
I think you have to look at the material and then ask yourself if having more of a routing and switching foundation will help you understand the objectives of CCSP.
Just some thoughts!
E.A. Broda
CCNA, CCDA, CCAI, Network +