What kind of wattage do I need for this?

I've been told I would need 400W by some people, others said 450W, some said I should go for a 500W to be safe.
But I do have a budget so I need to get just what's right and not much more.

Here are the specs:

CPU: Intel Core 2 Duo E6600, 1066Mhz, s775, 4MB
Mobo: 965P-DS3 s775, Conroe, DDRII 800, PCI-E
RAM: 2x1GB TwinMOS CL5
GFX: 7600GT 256MB TV, DVI, PCI-E
HDD: 250GB 7200RPM, 16MB, SATA II

Not planning on overclocking.
I was thinking about a 420W Thermaltake PSU, how does that sound?


By the way, I did try that eXtreme Outer Vision PSU calculator but I only got a result of 348W so I'm not sure how accurate this is.
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  1. Thanks for the reply.

    Does this mean that this PSU will not work for me?


    +3.3V +5V +12V1 +12V2 -12V +5VSB

    It doesn't mean anything to me...
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