Netgear has a 2 bay XRaid box for $250, plus the cost of whatever drives you want to add. I'm seriously considering that, you can pop out the smaller drives and rebuild the raid with larger drives automatically in the future, plus it has UPnP/DLNA built in.
Seems a lot of these boxes don't do all that well in the ratings for some reason.
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Drobo isn't a NAS, you have to add the drobo share to add it to the network. It's almost $600 without any drives, twice as expensive as anything else and then you have to download and install apps to add the DLNA server.
I found a cool one by LG, that has the DLNA server, plus a blu ray burner for about $300.
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Granted, it's for turning an old or cheap PC into a NAS box, it's really not that difficult to take those instructions and figure out how to make a Mac equivalent (assuming, of course, that you have no old PC's but an old Mac or two.) Just a money-saving thought.
I think what I might most likely do is build a linux box with good RAID, toss ubuntu on it and install PS3 media server.
Ubuntu already has everything Open NAS has, and I can use PS3 media server.
One of the problems I have is that the HD video off my camcorder doesn't play natively on the PS3. So, if I bought an off the shelf NAS I'd have to transcode the video before storing. PS3 Media server transcodes it on the fly, and works great.
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