I've noticed on Western Digital's website that they have released new versions of Caviar Blue and Black SATA6 hard drives. My current iMac is using a Blue SATA3. I'm planning on getting a bigger size drive (1-2tb), and would like to get some input on which would be a better upgrade. On paper, both Black and Blue produce the same amount of noise and use same amount of power, but a bit less than the older SATA3 version. My main concern is noise and heat, so I'm wondering if the faster Black drive would be a good upgrade, or if I should stick with same, but updated Blue that I have now. My system doesn't support SATA6, so I know that I won't utilize full speeds, but would like to know which of the two would be a better purchase while at the same time keeping the two concerns I mentioned at a minimal.