I'm in a quandary. I currently use a USB memory stick in a cambridge magic 6, but space is rapidly filling up. Not sure whether to get another USB or get a nas. At the moment I buy singles on I tunes but mostly buy cd albums and rip to alac lossless then save on a seagate hard drive. Would a nas be a better way, would it sound better and what nas recommendations could you make? Would I need to change hard drive?