I would not recommend the GTX 460 SE. The 768mb card is faster and usually at least the same price if not cheaper. Also If you are in the US you can get an HD5850 for $140 and it is significantly faster than even the GTX 460 1gb.
As for the PSU Cooler Master is not a good brand and their extreme power plus series in particular should be avoided. I would stick with more respected brands. Corsair, Antec & Seasonic are the best and some other lesser but still good brands include OCZ, Silverstone, Enermax and FSP.