PSU recommendation for new build

Hey gang,
I am looking for a PSU for my new build:

120gb Vertex 4 SSD
Geforce GTS 450
16gb Corsair Vengeance (maybe this brand)
4 1tb drives
1 dvd burner
media card reader
23in monitor
4 1tb external drives
Don't know what MOBO yet

How many watts Do I need?
Here is one I was thinking about http://www.newegg.com/Product/Product.aspx?Item=N82E16817703036&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&AID=10440897&PID=3332167&SID=u00000687
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More about recommendation build
  1. unless you plan on adding a second GTS450, the 400w version of that PSU will be more then enough for you.
  2. For a system using a single GeForce GTX 450 graphics card NVIDIA specifies a minimum of a 400 Watt or greater power supply that has a combined +12 Volt continuous current rating of 22 Amps or greater and that has at least one 6-pin PCI Express supplementary power connector.

    For a system using two GeForce GTX 450 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 520 Watt or greater power supply that has a combined +12 Volt continuous current rating of 31 Amps or greater and that has 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.

    The PC Power & Cooling Silencer Mk III Series 600W (PPCMK3S600), with its combined +12 Volt continuous current rating of 46 Amps and with two (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single GeForce GTX 450. It is also more than sufficient to power your system configuration with two GeForce GTX 450 in 2-way SLI mode.
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