First of all, you don't want that power supply that has only 25 amps on the +12 rail. It is very low quality. Any pci-e video card needs a BARE MINUMUM of 26 amps on the +12 rail.
Here is a 550 watt power supply that has 41 amps on the +12 rail and is a great power supply.
http://www.newegg.com/Product/Produc...82E16817139004
You might also want to consider moving up to a better video card. The one you have selected is not really that strong if you are in to playing games. I would look at a bare minimum of an 8800gt, if this were my rig.
A general comment, if you plan on any type of upgrading in the near future, you might want to consider even a 650 watt corsair power supply so you have room to grow.