I have a MacBook Pro i5 2.3 Ghz with a 120 GB OWD SSD in it. I'm about to get the OWC Data Doubler which makes it possible to add a second hard drive in place of the optical drive. I plan to buy the SSD as the boot drive with system and apps, and then the other drive for data storage. I need about 750 GB - 1 TB of space, and I'm wondering which HDD would be the best choice. It's been a while since I researched hard drives. I'd like it to be fast and quiet, and I'm willing to spend some money for a good drive. What do you think?