With the current black Friday deals I've decided to pick up some backup/extra drive space. So it's two 640GB WD Caviar Black for $50 each or a one 1TB WD Caviar Black for $110. I currently have a 320GB Seagate. My plan was to partition one of the drive to 320GB for backup of the drive I have now and use what ever is left to backup my movie collection in case something ever when wrong with the disc. The 1TB drive gives me less space but would most likely be cooler and quieter. The two 640GB gives me more space, but more heat and noise and would require a PCI SATA card as I've used all my SATA ports on CD drives and my one HDD. So what would you do, spend $100 for a 1TB drive or $130 for two 640GB drives with a PCI card? How easy would it be to move everything (all the files and windows) to the two 640GB?