My first question is the Make & Model of the PSU, which will determine if strong enough.
My second question is do you plan to run dual GPU's down the road? If so, your PSU isn't strong enough for dual cards. You'll want at least a 750w PSU from either Antec, Corsair or SeaSonic to be on the safe side.
Im not familiar with any good quality 525W PSUs, but the general rule of thumb is a good 500-550W (~40A on the +12V) will power any single GPU, a good 700-750W(~60A on the +12V rail) will power dual GPU setups.
Easy way for you to get a better PSU, im assuming you havent bought any of this yet, drop the 1.8GB GTX260, you get no benefit from more than 1GB of video ram until 2560x1600, instead of getting the special one with a lot of memory you can get a stronger card overall