Looking to get rid of my mid-2010 MBP and purchase an iMac. Main purpose of desktop will be as an iTunes server to access movies/tv shows from both of my Apple TVs. Occasional use will include web browsing and email and potentially light photo/video editing in future so I don't think I need something extremely powerful for now. Currently music/video library is about 600GB but will be growing in the future. My only worry right now is how to best handle storage options. I'm looking at potentially getting a 3TB external HD to store iTunes library and pairing it up with an Airport Time Capsule for back-up purposes. This a good set-up? Any recommendations on a great external HD? What do you guys think of the current config? iMac 21.5" 3.1GHz Quad-core Intel Core i7, Turbo Boost up to 3.9GHz 8GB 1600MHz DDR3 SDRAM - 2X4GB 256GB Flash Storage NVIDIA GeForce GT 750M 1GB GDDR5 Thanks for the help as this will be my first iMac purchase!