Right I want to purchase the new 27" for £1,699 but is upgrading the cpu and gpu actually worth it ? I want to upgrade the to the 680mx and to the i7 but is there much of a difference ? from the 675mx and the i5 ? I use the iMac for basic stuff like web surfing watching films ect but i also like video editing gaming and graphic design using programs like adobe premier and final cut pro x also photoshop and steam. Not a big pc gamer but I like playing the mac games which are available e.g. portal 2 and what ever comes out in the future ? I dont know whether to upgrade or not ! I really dont have the extra £300 to spend but I know its not possible to upgrade in the future due to apple thinking it was a smart idea to basically super glue everything together What do you guys think I should do ?