Hi there
The GeIL 2GB and 1GB PC2-6400 CAS 4-4-4-12 Kits are your best bet now. They can run at PC8500+ speeds at CAS 4-4-4-12 with ease and I've personally had a pair upto 1150MHz stable at CAS 4-4-4-12. Whats even more impressive is one of these 2GB Kits will only cost you £110+VAT!
Nothing can beat these kits when it comes to value for money and you will also find it hard to buy a better overclocking kit for more money as well, these really are the dogs danglies.
The code you want to be buying is MY-058-GL !!!!