I'm in the market for a 4 drive RAID5 device, and have figured out two ways to go about doing this. The first is to add a NAS to my network. The second is to add a RAID device to my Time Capsule via the USB port. I got this idea from looking at the OWC website, where all of their RAID devices connect only via USB or Firewire. The downside as I see it to the USB solution is that I would have to also get a USB hub since I already have a printer in that slot. The upside is that it seems to me that adding a USB drive to the Time Capsule is going to be simpler than adding it via the network, and would result in less errors, although I could very well be completely wrong about that. For some reason I think that the USB solution would result in faster performance, but I think I could be completely wrong about that, too. Any input would be appreciated. Suggestions as to which 4 drive RAID device/NAS to get would be appreciated, too. By the way -- I only want to use this device for external storage, not as a volume for Time Machine to connect to, if that matters.