Power Requirements for setting up a Raid Array

I recently attended a seminar that threw a lot of information at us.  While at first glance, I was immensely grateful to have attended, when the number of items discussed began to mount, I slowly stopped thinking how glad I was to be here, and started thinking, yeah... I need to check on that.  I'm going to be posting several questions on here shortly concerning SSD, Raid, Raid Controllers, and setting up a Cache Drive.  

Description:
This post is on Raid Power Requirements.


I am setting up a new computer, which has been a monstrous task in the making.

I am now using the motherboard seen here:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157299

The motherboard itself supports Raid 0, 1, 5, 10.  I have 2 of these Hard Drives.
http://www.staples.com/WD-Caviar-Green-3TB-SATA-30-3-Gb-s-IntelliPower-35-Desktop/product_391828

Current plans are to use this video card in the system:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814133383

The former plan was to get a third HD, and setup a Raid 5.  After the seminar, I am leaning towards buying a 3rd, and 4th, and setting up a Raid 10.


Question:

1.  What kind of extra power requirements am I looking at, if I want to run a RAID 10?
2.  Given the motherboard, graphics card, and Raid setup, what size PSU should I be getting?