It’s £509 without VAT at 17.5%. That’s makes the difference large but not nearly so huge. You’re dead right about the extras though. £70 for a bluetooth mouse and keyboard seems a bit steep to me. And by the time you beef up the RAM you’re not far away from the cost of 17″ iMac. But that’s not the point of the mini. It’s small, silent and unobtrusive. It kind of loses that appeal when there’s a plethora of alternative metal boxes dotted round the room.