Question : Problem: New Case & Power Supply

I have a Dell Optiplex 620 I am converting it to a Nas. I want to have a total of 5 Hard drives running. The Optiplex case is not really suited for this. So Im looking into getting a new case and higher powered power supply.
Any body have any suggestions on how many watts I would need in a power supply? Im going to have the 5 hard drives( WD5001ABYS), appx 3+ fans, RocketRAID 1740 PCI card, and a fan controller with LCD display.
Also is there anything I may not be thinking of?

Answer : Problem: New Case & Power Supply

A typical hard drive will draw at most 25 watts, fans will draw 5 watts, and the RAID PCI card maybe 10 watts.  The fan controller with LCD display is negligible, so that adds up to a total of 150 watts (for comparison, I had a desktop with 7 hard drives, a RAID 5 controller, 8800GT video card and E6600 cpu and it pulled 180 watts, as measured by a Kill-A-Watt device).  A good quality 400 watt power supply should be more than sufficient, such as one of these: http://www.newegg.com/Product/Product.aspx?Item=N82E16817151039

Fortunately for you, if you're reusing the motherboard, it will take a standard power supply and not require a special Dell adapter: http://support.dell.com/support/edocs/systems/opgx620/en/ug/A02/mtpwrspl.htm#wp1109155