Hello. Granted I'm thinking ahead and a lot can change in 12 months' but I am considering going back to an iMac once my loan with Barclays finishes next February. I currently have a late-2014 Mac Mini which has been fine for my needs but I prefer the all-in-one design of the iMac. I'd probably opt for the 4K model of the iMac 21.5" but for those who've opted to purchase that particular model has it been worth it? Or would I be better off saving up some more and opting for the 27" 5K base model instead? I know the RAM is soldered to the iMac's logic board in the 21.5" models (and that Apple aren't cheap in terms of purchasing extra memory). Cheers!