How much wattage do I need?

Hello everybody! I'm building a computer and I was wondering how much wattage do I need for a PSU?

My system specs are:

Seagate Barricuda 1TB
DVD-RW Combo
AMD FX 8320 Vishera @3.5 GHz
GIGABYTE GA-970A-D3P AM3+/AM3 AMD 970 SATA 6Gb/s USB 3.0 ATX AMD Motherboard
G. SKILL RIPJAWS X SERIES 8GB 1866 DDR3 RAM
ZOTAC NVIDIA GTX 650 Ti

and that's pretty much it.
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More about wattage
  1. For a system using a single GeForce GTX 650 Ti graphics card NVIDIA specifies a minimum of a 400 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 20 Amps or greater and that has at least one 6-pin PCI Express supplementary power connector.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most critical factor.

    Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.
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