Here's my situation. I currently have an iMac and 2 Windows laptops. The iMac gets the most use by far. All machines share an internet connection. For various reasons, this is done wirelessly for all, using my Airport Express. What I now want to do is expand the storage for my iMac. I currently have 250GB and would like to expand such that I have enough for Time Machine and also enough to store my ever-increasing photo and music collections. That's my main goal. But as a secondary goal, I would like the additional security and flexibility of a NAS RAID box. I'm sort of stuck as to which way to proceed. I would also like this to be easy and (relatively) inexpensive. Any thoughts or guidance is appreciated. Thanks.