Hi My mother's old 24" iMac is broken, and she's asked me to advise her what to buy if it's not economically repairable (we are taking it to an Apple Store tomorrow to get it looked at) She uses it for basic things (she uses her iPad most of the time). The most taxing thing she does is editing photos, she's quite a keen photographer and has a decent camera, so is editing large files, but she she does not do heavy duty photoshop editing on them. I think her best options are the 21" iMac 2.8 quad i5, (i'm not sure she would benefit from a 4K display as her eyes are not great), or a cheaper option of a Mac Mini 2.6 dual i5, and buying a separate screen. The main difference on paper i can see, is that the Mac Mini is dual core and the iMac is quad core, the Mac Mini will be about £300 cheaper with screen than the iMac. Is there any other differences i should know about? Is the difference in the quad core and dual core processor something she would notice using the included photo app? thanks for reading, and thoughts appreciated.