I want to be able to wirelessly back-up my MacBook Pro as well as have a high-capacity remote hard-drive. So, I could get a 1TB Time Capsule at a cost of £379. Or I could get a 1TB Western Digital NAS for £143 and, although I actually already have one, an Airport Express for £79 - a total of £222. So what do I get for my extra £157? I'm ready to be convinced, but as I see it at the moment, the WD option seems cheaper and will have exactly the same functionality. Any thoughts welcome, please!