A 560 will run fine on a 500w. But why get a 560? Better to get the 7850, which will drop to $150 this Christmas. It uses very little power, and is 1.5x more powerful.
Thanks for the quick reply. I have about £100-£110 to spend on a graphics card for christmas, really didn't know the 7850 was 1.5x more powerful, will consider it. Are there any better cards for around $170?
Also, is the power supply any good?, according to some websites, it's 80plus, but i'm not sure, only paid $33 for it though, looked pretty cool at the time.