I currently using Airport Express to stream my itunes music (stored on my laptop hard drive) to my AV receiver (Marantz receiver). However, I am looking to move my music to a network drive (Western Digital My Book World Edition). I would like to stream music on itunes from the network drive (attached to the Airport Express) to the AV receiver. I also want to play video and display pictures stored on the network drive on my TV (through my LG blue-ray player). How do I do this? I was thinking of buying an Airport Extreme, but it looks like the Extreme does not stream iTunes.