Recommended hardware for Snort IDS

[nils at hemmann.de (Nils)]

What hardware are you guys using for your IDS systems?

We are monitoring a 1000Mbit/s link with an average bandwidth of 
30Mbit/s. A second link with a similar bandwidth will follow.
After a successful test with a small system we'd like to order a 
dedicated server. Preferably HP DL xyz G4 or G5.
OS wise we are tight to Red Hat Enterprise 5.4, IDS software is Snort 
with BASE, maybe switching to Anval.

Any recommendations from the field?

Thanks,
Nils