looks really nice, if you have some budget left, i woul add it an SSD as a boot disk
i think there's some webpage where you can find if a PSU is adecuate for a certain graphic card, provided is the only one
EDIT: on the web page says you need at least 500 watts
http://www.sapphiretech.com/presentation/product/product_index.aspx?pid=2037&lid=1#