I am going to put the 320GB drives into RAID0. Also changed to 1000w psu anyway, come in use if I ever added another graphic card.
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That PSU is definitely not needed, If you want modular go for a be quiet, you don't need to stick with corsair, although they are good, there are others out there just as good. As for adding another card, in this situation another 4890, good luck fitting it on that board, In my opinion I wouldn't bother even attempting it.
Both of these are excellent PSU's, enough power (and more) for your needs. Also both are quiet and modular.
http://www.overclockers.co.uk/showproduct.php?prodid=CA-017-ZA&groupid=701&catid=123&subcat=1102
http://www.overclockers.co.uk/showproduct.php?prodid=CA-022-BQ&groupid=701&catid=123&subcat=1083