What graphics card will you be using?
Here is what EVGA recommends for their graphics cards:
GTX550ti needs 400w with 24a on the 12v rails plus one 6-pin PCI-E power lead.
GTX560 needs 450w with 24a on the 12v rails plus two 6-pin PCI-E power leads.
GTX560Ti needs 500w with 30a on the 12v rails plus two 6-pin PCI-E power leads.
GTX570 needs 550w with 38a on the 12v rails plus two 6-pin PCI-E power leads.
GTX580 needs 600w with 42a on the 12v rails plus one 6-pin and one 8-pin PCI-E power lead.
GTX590 needs 700w with 50a on the 12v rails plus two 8-pin PCI-E power leads or 4 6-pin power leads.
The case can take any of those. Assuming you use a GTX580 nd budget is not a big problem, I would go with a Seasonic X Series X650
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151088 It is gold certified. I have the X750, and the fan hardly turns.
I really like the concept if a itx gaming build. Why don't you use a 2500K? The cost is marginally higher, and it is an easy oc to 4.0+
Also, I don't like having a radiator for your liquid cooler blocking the 140mm intake fan. A nonoverclocked 2500 really does not need much cooling. It is the graphics card that needs the airflow. I suggest a low profile downdraft cooler. The scythe big shirulen will fit, but there may be some other good ones:
http://www.newegg.com/Product/Product.aspx?Item=N82E16835185172