I am mainly looking for a NAS to serve as an iTunes server for my 2 Macs and my Dell Mini 10v that runs OS X. My question is which is best and also how would I setup iTunes to move files to the NAS when I buy more music, movies, sync my iPhone, iPod.. etc etc... I would not need to use it for backup but would want to have at least 2 drives so they would be mirrored to prevent data loss.