now i've the Cooler Master eXtreme RS500 it's good though for it price, now im getting a GTX 260. And im woried about the psu, if it was enough to run the GTX260. The official recommended PSU for the GTX260 is 500 Watts. But i dont know if my psu can handle it !
Its 30 amp total on the +12 volt rails is a little on the low end since 36amps is what is recommended.
Have you considered the HD5770? It is cheaper than the GTX260, is power efficient, about the same performance (about 1 % slower on average) and will run fine with your PSU.
BTW, i checked some of the 260 PSU things, it says that the eVGA GTX 260 core 216 (the one i'll have) needs a 12v with a 36 amps, and my PSU have 4 or 3 12v with a 18 amps, the 260 needs to power capels. I guess thet will be 36 amps. Im i right ?