I have about 700+ ripped DVD's primarily on one external hardrive. I also have my entire Itunes library on that external harddrive as well. The HD is connected to my imac and I serv the movies to my house with Apple TV2 in all rooms. I would like an ultra capacity simple raid solution that I can connect via firewire. I would rather not hassle with NAS since I have the interface with ATV2 already. Any suggestions on how to do this cheaper than the $600+ drobo?