Hi, I am getting an 27inch iMac, as i've started doing some app development and would like an update. Currently i'm on a 15 mbp late 2009 (2.53, 250gb etc). So far i've decided on the following spec 3.2GHz Quad-core Intel Core i5, Turbo Boost up to 3.6GHz 8GB 1600MHz DDR3 SDRAM - 2x4GB 1TB Fusion Drive NVIDIA GeForce GTX 680MX 2GB GDDR5 that brings it to £2,000. My question is do i need the i7 for app development, should i trade out the graphics card for it or bite the bullet at upgrade the processor too?? I can't afford the 768gb SDD but is the 3TB drive a reasonable upgrade? PS, I will update the ram, probably to 16 then 32 gig by adding ram two at a time when funds recover a little. If anyone has ordered my set up or thought over the same issue i'd be really grateful. PPS I can't afford a mac pro haha!