Hello, I am planning on upgrading to a GTX560TI with this power supply i currently have http://www.coolermaster.com/product.php?product_id=2550
Other components of the system will be 8gb of PC-12800 memory, Intel i5 2500k, a single 7200 rpm harddrive and dvd rom with one 120mm fan and one 80mm fan.
I don't know a lot about the voltages or amps. It has 19A on each 12V rail
As Sunius said don't go for cooler master. GS600, CX600 will be a good choice.. GTX560ti requires 32A on +12V rail.. Also i repeat don't go for that coolermaster one.. Corsair, Seasonic, Antec, XFX, OCZ make good quality power supplies..