Mac Mini cannot be used for pro retouching.
The Mac Mini can not be considered a pro model for photogs and retouchers at all. Not with one tb port. To use a dual monitor setup AND use the tb port for an external drive using tb like the OWC helios PCIe, you HAVE to use an apple display wich is awful for serious color work. It's a shame, was so close to ordering one of these for the price it would have been unbeatable. Only option is the MBP retina for the dual tb ports...but that's twice the expense. New macpro would be the only other serious option if it ever comes out.
Mac mini