Hi Everyone. I have a 2.66 GHz 2009 20" C2D iMac with a 320GB HDD. AppleCare has run out and I was trying to find the best and largest Capacity HDD to replace the original one with. I currently have all of my media on a WD 1TB external firewire/usb 2.0 (of which I have already used about 920GB)and would prefer instead to have it all on my internal drive to reduce power consumption of an extra device, and to increase read/write speeds. I've been looking around, but I don't know for sure which one would be the right fit. Thanks in advance.