And which is faster?
(450GB)x2 SAS configured for RAID 1 (mirroring) with 15k RPM, 16MB cache http://www.newegg.com/Product/Product.aspx?Item=N82E16822148559
or
(300GB)x3 SATA configured for RAID 5 (striping with parity) with 10k RPM, 16MB cache http://www.newegg.com/Product/Product.aspx?Item=N82E16822136802