I have this-http://www.ebuyer.com/product/131052
Is it enough for my system-
1 HDD 7200RPM
1 IDE disk drive
780i Mobo XFX
GTX 260 216 edition
2 case fans
arctic cooler pro 7.
4gb KINGSTOM 1066 ram
EVGA's GTX260 core 216 says it needs a minimum 500w PSU. Corsair makes a good PSU, but still. You'll have absolutely no headroom for expansion or overclocking. Research the total power consumption of your components. It might be a headache but its worth it. On the other hand, I'm only using a 500w PSU and I've never had a problem in the 8 months since I got it and its on almost 24/7. So make sure its got more than a single 12v rail, and doesn't fluctuate voltages, amps, etc too much under load. CPUID's hardware monitor should allow you to guage that.
I've had no problems at all for a year, even when stress testing.
This thing has 33A... 396W of the 450W on the single 12V rail. It can easily handle your proposed system. If your video card requires 2x power leads, you will have to use an adapter (that's what I use) because the Corsair 450W only has one 6-pin.