Thinking of buying a Mac Mini to replace my ageing, and currently disabled MacBook Pro. Is there a lot to be gained by getting the more expensive Mac Mini over the cheaper model? Apart from the i7 over the i5, and the bigger hard drive (would get a cheap, high capacity network drive instead), would it be better to get the cheaper model? Want to have RAID storage to back up iPhones, an IPad and a Nexus 7, plus usage as an XBMC hub, etc. Would the best option from a cost per Tb issue be to buy an external hard drive such as WD Mybook Live model? Whilst I'd love another iMac, don't think it'd be practical in terms of cost, and as a multimedia solution.