I currently use a Home built FlexRAID solution. I had many older part laying around and didnt really need to buy too much. I used an old case, with 2x2TB WD Green Drives (yes I know), 3x1TB drives, 800GB Drive, I ended up buying an eSATA external 4bay cage and stuck my 3TBs and 800GB in it. I am running ubuntu server off a USB drive. So far it has worked great, fortunately I have not had to test a full drive recovery with it so I can not speak to that completely but from what I can tell it works fine.
I use 2x1TB as parity and that leaves me with 5.8TB of space. since Flexraid is only a snapshot raid as soon as files change the raid has to be rescanned. it makes it pretty easy to do and I have been updating mine for a long time. Every now and again I will rebuild the entire thing from scratch just to be safe.
But it is cheap and easy for me. Also I use XFS (yes I know about that too but too late now) if that makes a difference.
I do have a AR3700, although I can not say too much since I had it for about 2 weeks (worked great playing all my movies, with a little studder in one 1080p movie I have, but only in a short action part). I did not try netflix but hulu did not look good on it at all. But then again my entire machine died on me after the 2 weeks.... I did just get the replacement from UPS the other day, and can not wait to get some time to set it back up.
SoBBie