Hi, I'm upgrading my old 24" iMac to a 27" when the new ones are released, and was planning on getting the 3TB Fusion Drive version. However perusing the threads here it seems like a lot of you seem to be going for an external HDD solution for media, images, documents etc. and an SSD drive in the iMac itself. I'm just wondering what the benefit of doing it that way is apart from more control over where specific files are stored? I've been looking at possibilities for storing media like the Western Digital 6TB Thunderbolt Duo, but another back up solution isn't really that important to me as I already back up to both a Time Capsule and an online service (Crashplan). At the moment I only have about 1TB of media files, so I'm guessing 3TB would last me a while. The only other file requirement I have is to stream files from my iMac to my Apple TV. So any thoughts? What would you do in my position? Thanks in advance for any advice!