Three questions concerning the new 2012 27" iMac. 1. Does the SSD require any type of defrag or is the firmware intuitive concerning automatic placement of the primary used software? 2. I imagine the upgrade video card 2G DDR5 will generate a considerable amount of thermal heat, especially when the latest 3D games and/or extensive video application software is used for a long period of time. The iMac footprint appears very thin and would believe the internal cooling may be limited? 3. In today's technology/cost is the $1300 upgrade for the SSD a fair market price? I am a little hesitant on the above purchase configuration because of the above concerns and hope a knowledgeable mac user could enlighten me on the possible outcome. Thank you'