But its not nearly as good of a deal as the ones i linked, as you can buy a radeon 6850 for 139.99 new. (although in the games that i play like world of warcraft, the gtx 460 is a lot faster than the radeon 6850).
a GTX460 build needs 24a on the 12v rail and you have 28a so it will work. most people would prefer a little more headroom like the CX500 but it will work. you will need to use of the power adapters that come with the GTX460.