I'm working on a project on a somewhat short timeframe and am looking to buy a new iMac to work on it. I do alot of photo editing and amateur video projects so I'll be doing very little video editing. I'm going to buy the 21.5" and select the following specs: 3.1GHz Quad-core Intel Core i7, Turbo Boost up to 3.9GHz 16GB 1600MHz DDR3 SDRAM - 2X8GB 1TB Fusion Drive PS - is the fusion drive really worth the $200? I typically buy applecare so don't want to do self-install due to warranty issues. Thanks!