I currently have a 2009 2.26Ghz 8-core Mac Pro with 6gb ram and ATI Radeon HD 4870. I do a lot of video editing and after effects work. I'm finding this system is becoming a bit slow and I'm thinking of upgrading this system or buying a new iMac i7 3.4ghz with 2gb GeForce GTX 680mx. ( upgrading ram later). Upgrading my current system would include GeForce GTX 680 Mac edition, 32gb ram and a larger display. (Currently using a 23" Cinema Display). The other option is selling the Mac Pro (current bid €1850,- including display and fcp studio 3) and buying the new iMac. I'm looking for advice. Will I gain much performance when I buy the iMac? When I choose to upgrade my current system, how many years will I add to the life of my already 4 year old machine? Thanks in advance!