Conquest of the Horde

I don't know A THING about hardware. I'm a software guy. That being said, my new video card seems to pull too much power, so I'm upgrading from 600W to 650W. So I'm looking around, and I saw OCZ (thats the same model as my old power source) makes a 650W. I don't know if it will be any good with my current setup though.
My most current computer build:

Motherboard: 1 x GIGABYTE GA-EP45-UD3P LGA 775 Intel P45 ATX Intel Motherboard
processor: 1 x Intel Core 2 Quad Q9550 Yorkfield 2.83GHz
video card: 1 x EVGA 01G-P3-1561-KR GeForce GTX 560 Ti
RAM: Kingston HyperX 2GB 240-Pin DDR2 (I have three of these.)
CPU cooler: Zallman
HDD: I must have ordered this from another site. It's basically a western digital 1 TB.

This is the power supply I am looking at:

OCZ ZT Series 650W

I'm sure someone on here knows about hardware.

If you feel a 600W isn't cutting it then I don't think a 650w will be much of a difference. I'd try to find something 700+. Cooler Master makes some decent power supplies in my experience.