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RAID 5 isn't the best choice for your planned use, intense write. This is due to the write penalty when the array must do the parity bit calculations and subsequent write. I would go with RAID 10 with 4 or six drives or more based on your performance needs. Also, just about any WD drive will work but have you considered the WD RE series, designed for RAID: Western Digital RE WD2000FYYZ 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Enterprise Internal Hard Drive Bare Drive
http://www.newegg.com/Product/Product.aspx?Item=N82E16822236352

EDIT: and to maximize storage capacity, chose a fairly small clustersize, 8K would probably be best. A lot of space is wasted when using large clustersizes.

EDIT2: forgot to mention, a hardware RAID controller is always more reliable than software RAID. Nothing more of a PITA than rebuilding an array.
 
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