I will be building a new system and so far I have purchased a Western Digital Caviar Black 640GB drive. My original intent was to use only this drive. I'm contemplating using two drives, the first for the OS, games, and applications, the second for storage of music, pictures, videos. Will I see any performance advantage? If i decide to go this route would a Caviar Green be ideal for the second storage drive? I assume that I don't need any RAID configuration, since the second drive is only for storage.