Stuck in a pickle and could use some help from people who REALLY know Macs. I'm trying to decide between buying the following Macbook Airs: [bold = perceived spec winner, red = I don't know] 1) $1119 i7 refurb (July 2011 release) Processor: 1.8GHz dual-core Intel Core i7 L3 Cache: 4MB shared Memory: 4GB of 1333MHz DDR3 SDRAM Hard drive: 256GB flash storage Graphics: Intel HD Graphics 3000 processor with 384MB of DDR3 SDRAM shared with main memory2 Ports: Thunderbolt port, two USB 2.0 ports, SD card slot Wireless: IEEE 802.11a/b/g compatible 2) $1189 i5 refurb (June 2012 release) Processor: 1.8GHz dual-core Intel Core i5 (Turbo Boost up to 2.8GHz) L3 Cache: 3MB shared Memory: 4GB of 1600MHz DDR3L SDRAM Hard drive: 256GB flash storage Graphics: Intel HD Graphics 4000 Ports: One Thunderbolt port (up to 10 Gbps), Two USB 3 ports (up to 5 Gbps), MagSafe 2 power port, SD card slot Wireless: IEEE 802.11a/b/g compatible My main usage will be all of the MS Office suite, Photoshop, and heavy browser usage (e.g. tons of tabs) concurrently. I'm also going to start dabbling with iOS development (running xcode) and video editing with either Adobe Premier or Final Cut. So a few questions: 1) The i7 doesn't list any Turbo Boost. What's up with that, and what the heck is Turbo Boost anyway? 2) Is the DDR3L RAM in the i5 superior to the DDR3 in the i7? 3) Will the 4000 graphics card in the i5 be a noticeable advantage with my uses listed above? 4) The i7 being 2 years old is really bothering me. Is buying 2 year old Apple technology dumb (i.e. will I not be able to upgrade OS in the future or something)? And of course, which machine would you recommend overall based on my usage? Pricing isn't really a factor because it's so close. Thanks so much! Really appreciate any help here.