Ive never used the memory thing on the website, but if you know you ddr2 memory then you could stick any ddr2 no matter what speed into the motherboard, just it would be a waste to buy faster than 667 for the first board because the motherboard would just clock down the memory clock to that spread from what ever speed its at when bought... So if you match the ddr2 part of the memory there really no way you could make a mistake..
Phenom 9850 x4, Asus MVP Deluxe , 8gigs OCZ ddr2 1066, Visiontek 3870x2, Xfi Elite,2x WD Raptors 10k in raid 0,Antec 1000watt, and Cooler-master Stacker 830 Evolution.