[c-nsp] Netflow Questions

[Jeremiah Millay]

I'm running two 7206 VXR routers with NPE300s. The IOS version I am 
running on both is:
IOS (tm) 7200 Software (C7200-JK9O3S-M), Version 12.2(31), RELEASE 
SOFTWARE (fc2)

I recently start exporting and collecting Netflow data using the 
Nfdump/Nfsen combo. I have a few questions about Netflows "order of 
operations". Is netflow data collected before traffic hits the inbound 
ACL. It appears as though it is because I'm seeing flows in nfsen that 
are getting blocked by my inbound ACL. I guess I'm looking for 
verification on this.
Another question I had was about SNMP MIBs for collecting Netflow and 
NBAR statistics. Does anyone have a recommendation of a stable IOS image 
that supports these MIBs? I've tried using the software advisor and got 
a list of IOS images that will work but I was wondering if anyone else 
that is running similar hardware has any recommendations based on 
experience.
Thanks,
Jeremiah