Well the card I'm going to buy
EVGA | Products, is almost exactly like the reference card and according to nvidia's website, the maximum graphics card power is 150W. It should not pull more than 150W. That was probably an overclocked edition or something.
GeForce GTX 560 - Specifications - GeForce
I would buy that power supply but I live in Toronto. I'll try my current PSU and if it blows, then I'll have to buy another one.