Well, the only reason I need to upgrade at the moment is because of system speed. I think I will leave upgrading the hardrives for now. The current hard drives I have:

1. ST3802110A ATA Device
2.WDC WD10EACS-00D6B0 ATA Device

One hard drive is 1TB and the other is 74.5GB (The smaller drive is the older of the two which, I currently use as my system drive)