Complete newbie after build help

Quick question that hasn't been answered on my thread in the GPU forum - hopefully with the extra traffic through GH I'll get an answer:

I'm looking to get a 470 - probably in Gigabyte SOC flavour. I've been told however that my PSU (Corsair CX-400W) isn't enough to run a 470.
So how big do I need to go? Will the Corsair CX-500W do or do I need to go all the way to a Corsair CX-600W or TX-650W?
My current spec is in my sig and I'm not planning on adding anything to that.
 
Its an extra £20 and I'm not sure what benefit the TX-650 holds over the CX-500. I freely admit I know sod all about PSU's though.
 
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