you can try googling it for a few memory reviews...
if you want high performance memory, look into Mushkin, Kingston HyperX, Corsair..
I have Kingston Hyper-X PC3500 and it's fantastic memory. runs at very high speeds and is perfect for overclocking. for non-overclocking just buying something like Crucial PC2700 will ensure stable reliable operation.
If you are still using SDR RAM, time to upgrade !
