first of all,i can afford both and my i have a space in my desk for the 27'' imac. i will use the new imac for internet browsing,gaming,watching videos,etc. i will get the 6970M gpu if i get the 27'' imac. i will spend most of my time on the new imac for watching videos (more then gaming) and most of my videos are 720p and some are in 480p. the problem is that gaming is better on the 27'' imac and watching videos is better on the 21.5'' imac. i would like to play some future games like DmC (most wanting game for me),MGS:R, the witcher 2. Thanks for answering.