6500 with ASA module

Question

Hello guys,
I'm designing small-medium branch office (from 100 users scalable up to 500).
My idea was to build this around a pair of 6506-E switches (as collapsed core, utilizing VSS), then at each floor (1 floor = 100 users) have a stack of 3750 switches.
Now, to my question, I want a pair of security appliances, one per each breakout. I was looking at a possibility of putting ASA module into each 6500.
Is it possible, to use 10G X2 module, which are build into 6500's SUP as WAN interface and direct everything it receives on those ports directly into ASA? (I want to have all traffic which will come to the 6500 via SUP's X2 modules to pass through ASA before any further action will be taken).
As fair as I know in order to use VSS together with ASA modules in active/active mode (I will load balance through uplinks on both 6500) I need to use SUP 720-10G, am I right?
Thanks in advance for you insights.
Michal

Answer 1

Thanks guys. Appreciate your feedback!
I will most likely go  for the option "Existing ASA 5540 with IPS module" . I hope the IPS module does not limit any bandwidth capability or processing issue of the ASA. My current throughput is 250 Mbps bidirectional.
After looking at the IPS option I am sloghly confused which one I need. Cisco website say:
"...adding the broad range of intrusion prevention and advanced antiworm services delivered by the IPS modules via the AIP SSM and AIP SSC, or the comprehensive malware protection and content security services enabled by the CSC SSM."
Do I need SSM only or both SSM and SSC or CSC SSM? How many module cana be installed on 5540?
Fawad