Need a new pay but what wattage?

[doggystyle]

Ok my old 550w psu has chucked it.
I need a new one but what size ?
I5 2400k. 8gb mushkin ram. 380x xfx graphics card. 240gb Kingston sdd. DVD writer.
Coolmaster say I only need a 383watt. It seems low.

Amy recommendations?

Thanks all