Our 2008 24" imac is getting to the point where its having a hard time swallowing normal tasks like dealing with our 23000 picture iphoto library. 5 years is a long time in computer terms. I love the new 27" imac but from a practical standpoint i like the idea of a mac mini mated with a top screen like the Apple TB display. The advantage i see with the latter that a one time investment will make me more future proof... I can switch out the mac mini for a newer one in 2-3 years time instead of waiting 5 years like i'm doing now. The mac mini setup, with the top of the line i7 processor and fusion drive (i'll upgrade the ram to 16GB myself) with a ATB display actually comes in a bit cheaper than the i7 27" imac as well. Besides the more powerful graphics card in the imac, is there really anything else i'm missing? My typical usage for the mac isn't very demanding... Photo editing and cataloging, browsing, occasional vmware into win7, office stuff. I want something that will last a while!