How much watts?

So, I'm sure this comes around many times; it's my first build ever. After some enlightening from friends, and 4 days of research, I've gotten a basic understanding of what goes, what doesn't, and how some things work. I'm pretty confident in the build I have so far.

However, I'm not entirely sure how much wattage I should be working with. I did use the eXtreme PSU calc online, and I've been recommended 650 watts, but it doesn't hurt to check even further.

I do plan on overclocking, too. But I'm also not too sure how the wattage works with that. Anywho, here's the build...

CPU: Intel Core i5 3570K 3.4GHz LGA 1155 Processor
Cooling: Cooler Master Hyper 212 EVO Universal CPU Cooler
Motherboard: Gigabyte GA-Z77X-UD3H LGA 1155 Z77 ATX Intel
Video Card: Gigabyte NVIDIA GeForce GTX 660 OC 2
Storage: Western Digital Caviar Blue 500GB 7,200 RPM SATA 6 @ 6gb/s
Memory: Crucial Ballistix Sport 8GB DDR3-1600 PC3-12800) (2x4gb's)
Optical Drive: LG 24X DVD Burner GH24NS95 - OEM
Case: Thermaltake V3 Black Edition ATX Mid Tower Computer

This is on a budget of $850, and currently hitting $730 with the current parts. So $120 to work with.

My question: How many watts is enough to run this build? I want a little more than enough watts to be able to reach peaks. Any suggested PSU's I should get?
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More about watts
  1. The max TDP of a GTX6600 is 140 watts. I estimate your total system power consumption at around 300 - 350 watts. For this system a good 500 watt PSU would be perfectly adequate,

    Most power calculators overestimate the size of the PSU needed. The minimum that I would put in would be a good 550 watt PSU - Seasonic or XFX (also built by Seasonic).
    But for a build like this, I would probably install a 650 watt PSU. A good 550 watt PSU would be better than a cheap or mediocre 650 watt PSU.
  2. So a higher priced PSU with less watts > high watt, same priced PSU. Quality > quantity.

    Thank you!
  3. For a system using a single GeForce GTX 660 (non-Ti) graphics card NVIDIA specifies a minimum of a 450 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 24 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) will 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.

    Measured power draw for the Gigabyte GTX 660 Windforce OC 2 GB graphics card only:
    While running FurMark or GPGPU processing: 129 Watts
    While Gaming: 120 Watts

    Even this PSU will work:
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