Need PSU Help/Recommendations

As a First time builder I seem to be having the most trouble with choosing the right power source in wattage. I am very confused on how much wattage my new PC will be using.

Here are my Specs current parts:

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($215.99 @ NCIX US)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($27.98 @ NCIX US)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard ($134.99 @ Amazon)
Memory: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600 Memory ($40.99 @ Newegg)
Storage: Western Digital Caviar Black 1TB 3.5" 7200RPM Internal Hard Drive ($89.99 @ NCIX US)
Storage: Kingston HyperX 3K 120GB 2.5" Solid State Disk ($99.99 @ Newegg)
Video Card: MSI GeForce GTX 660 Ti 2GB Video Card ($299.99 @ Newegg)
Case: Antec Nine Hundred ATX Mid Tower Case ($99.98 @ NCIX US)
Power Supply: Rosewill Hive 650W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($69.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($15.99 @ SuperBiiz)
Monitor: Acer S231HLbid 23.0" Monitor ($159.90 @ Amazon)
Total: $1255.78
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  1. Best answer
    A system with a single GTX 660 Ti needs a recommended 450w power supply. If you plan on adding a second card in Sli go with a 650w unit.

    That Rosewill is not a bad model at all. This is better for the same price though.

    Here is a better SSD for cheaper.
  2. Best answer selected by trambo18.
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