You can certainly save building your own Drizt, but what you miss is the support. Considering this device is holding all your data, if something happens its nice to know there is somewhere to call that MAY be able to help (my data has been rescued twice).
They way I look at it, almost any mug can put the hardware together, the premium I'm paying for is the brains of the software engineers (skills I dont have) that make that hardware do all the tricks. Mind you the DS2411+ is also cheaper than the price quoted.
Couple of quick thoughts about the specs above,
-You wont use sas drives, they are too expensive (though I realise they sas expanders support sata)
-You will never see benefit from SATA3 with HDDs (SSDs are a different storey, but your building for capacity not speed)
-Most uncompressed BD HD video/audio streaming is around 4-5MBs there is a few extreme test files (Birds) that will push a max 8-9MB/s so ignore the 30MBs its pointless
Anyways not saying you shouldn't build your own, just, like budd said, weigh your goals and options.
Edit - crap spelling
Edited by K1LL3M, 15 March 2012 - 09:54 AM.