I went ahead and got the OCZ SLI-Ready PC2-6400 CAS4 2GB kit (OCZ2N800SR2GK). $35 AR from the Egg with free shipping was too tempting. It took some tweaking and moving them to the secondary slots to get them stable, but they seem OK at 800MHz 4-4-4-15-1T. I hope I don't come to regret this - I'm a little troubled that they wouldn't run right in the slots I had my Firestix in, but I've always heard the P5N-E SLI was really picky about memory & timings, and have heard many complaints about memory performance in the yellow slots. Time will tell.