I need more space for family photos/video (currently limited by 160GB internal HD on iMac), and I'd like to get a 1GB external RAID1 setup so I have 500GB or storage with automatic backup. I was looking at this -> http://www.maxtorsolutions.com/en/catalog/OTIII_Turbo/ However, the one thing that bothers me about that one and the Lacie equivalent is that if a drive fails, it is not user replaceable. Can anyone recommend an alternative where the drives are user accessible? My budget is about $500. Ideally, the drives would come in and out the way they do on a mac pro.