How many watt of power supply do I need for my Desktop?

Hello,
I am trying to build my desktop for gaming, video/photo editing. I wonder is everything compatible and how many watt of power supply do I need?

Tower Case: Cooler Master HAF 912 Flagship Mid Tower
Motherboard: GIGABYTE GA-P67X-UD3-B3 LGA 1155 Intel P67 SATA 6Gb/s USB 3.0 ATX Intel
CPU: Intel i5 2400
Ram: Corsair 8GB (2x4GB) DDR3 1333Mhz
Video: GIGABYTE ATI Radeon HD6850
HDD: Seagate 1TB 7200RPM 32MB Cache
DVD: Lite-on Light scribe 24x SATA DVD+/-RW Dual Layer

I am having trouble to pick the Watt for the power supply. Also is everything compatible? Any suggestion on my build? Your help would be highly appreciated.
Thank You
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More about watt power supply desktop
  1. For a system using a single Radeon HD 6850 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 27 Amps or greater and have at least one 6-pin PCI Express supplementary power connector.

    For a system using two Radeon HD 6850 graphics cards in 2-way CrossFireX mode AMD specifies a minimum of an 600 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 36 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.
  2. Rosewill Green Series RG530-S12 530W
    ATNG made and 41 amps.
    Rosewill Green Series RG430-S12 430W
    ATNG made and 33 amps.
    Antec EarthWatts Green EA-380D
    Delta made and 28 amps.

    Max power consumption is about 24 amps with a i7-920 (power hungry CPU).

    Why are you using a P67 w/ a 2400?
    ASRock Z68 Extreme3 Gen3
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