What power supply (PSU) will provide enough power to my computer? and is the most well built.

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The specs of the computer are:
Motherboard: ASROCK N68C-S UCC
CPU: AMD Athlon II X2 250
RAM: 4GB DDR3
Graphics card: PowerColor 5450 1gb
1 Hard Drive and 1 DVD/CD Drive.

I have currenty narrowed my choice down to:

CORSAIR Builder Series CX430 Fixed ATX PSU - 430 W -

EVGA 430W Power Supply Unit.

EVGA 500W 80 Plus White Power Supply Unit.

Thanks for your help!

 

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