I am still considering selling my iMac that I bought in 2010 (2.8 GHz i7/12GB RAM/2 TB HDD) before the AC expires. Rather than go with another iMac, I am curious if there is any advantage of going with the Mac mini + ATD? Costs seem comparable however seems you get more computer with the iMac? Option #1: ATD @ $999 + Mac mini 2.6 GHz i7/ 4GB RAM/ 1 TB HDD @ $899 = $1900 Option #2: 27 iMac 2.9 GHz i5/ 8GB RAM/ 1 TB HDD @ $1800 The mini has the ability to upgrade the RAM and HDD at a later time (to 16GB and a SSD) however the 27 iMac you can only upgrade the RAM (to 32GB) and won't be able to add an aftermarket SSD. While both drop the optical drive, the iMac retains the dedicated GPU which is nice. That NVIDIA GeForce GTX is one nice card. Since the mini uses the mobile processors, I assume the iMac will be slightly faster? So it seems there are two major difference: with Mac mini I get ability to upgrade system and with iMac I get dedicated GPU. Is that it?