My wife and I are thinking about replacing our venerable 2007 Macbooks with a single iMac. However, as we really only need it occasionally, are on a tight budget and don't need the mobility, we're thinking about buying a used mid 2011 21.5" iMac. There is one significant issue though: Storage. Just my Macbook has about 500GB of stuff and my wife's probably has an extra 300GB, mostly music and pictures (recently bought an SLR camera so taking pictures like crazy, each coming out at over 4MB). The stock 500GB drive will not do so I could upgrade the HD (maybe 2TB), but I've heard the horror stories about the fan going crazy with non-apple HDs. The other option (and for which I am absolutely ignorant) is to use a NAS or some sort of external drive. My main question is whether these NAS drives would provide seamless functionality with my mac. For example, can I store all my music there and will iTunes read it from the NAS rather than the internal drive? Will the same happen with iPhoto, my documents, etc? Will it work with different user accounts? Would I need a specific NAS drive to pull this off or would any drive do? Thanks in advance!