Ok, while the 2012 model will be shipping before year's end I am thinking that perhaps I should wait for the 2013 model. I am considering this as the Intel chips (Ivy Bridge) for 2012 was released mid-year and the next Intel chips (Haswell) for 2013 is scheduled for release as early as March. I am concerned that if I get this year's model Apple will make it obsolete in less than 6 months instead of around 12. Just speaking out my worry. Really trivial. Apple will offer both the 2012 iMac and 2013 iMac with Retina display? Built-in GPU would have double the performance by then so it could drive the lower-end model.