Ability for SIM to perform tcp stream reassembly

Hello.

I am currently evaluating some SIM products, however, I am having difficulty 
getting the vendors to understand what I mean by tcp stream reassembly.

One of the thinfgs I want the sim to do is the be able to take raw packet data 
-- i.e., what is in tcpdump -r  file -s0 -- search it for a text string, and 
turn it into a file.

Right now, what I have to do it take the a known time that an event happened, 
unzip it, tcpdump -r file -w file2 <some filters here>, tcpflow -r file2, and 
grep <string> * to find what legal has requested.

Anyone know of which ones having this capability built in or can add it on?

Thanks,
Thy

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