I kinda feel like I'm stuck here . I can't decide which desktop to get out of either the quad core Mac pro (base model) or the new iMac 27" with the Fusion Drive and the 680mx graphics card. I like the iMac very much, but would like to have tower that is upgradable, i am aware that the hardware is around 2 years old now. So will the 2 year old hardware be able to compete with the iMac in terms of performance or am i better off getting the iMac or waiting for the next generation Mac Pro? Thanks.