Need Help Choosing PSU + Check my build

I need someone to check my new build and I also need help choosing a power supply and i want to know how many watts I need based on the parts i have.

Approximate Purchase Date: Around May or June

Budget Range: $500-$600

System Usage from Most to Least Important: Gaming

Parts Not Required: keyboard, mouse, monitor, speakers, optical drive

Preferred Website(s) for Parts: newegg.com, amazon.com

Country of Origin: USA

Parts Preferences: AMD cpu, ATI video card

Overclocking: No

SLI or Crossfire: No

Monitor Resolution: 1920x1080

Additional Comments:
-I don't know how many watts for the PSU I need for this build so I need help with that.
-For the motherboard should I go for ASRock 770 or Asrock 870?
-For the ram should I buy one Kingston 4GB (2 x 2GB) and buy another one later or should i just get the Kingston 8GB (2x4GB)
-Is the Stock Cooler for the CPU good enough to keep the CPU cool?
-I don't mind lowering the resolution or lowering in game settings to get good frames per second.
-I might get a sound card if the Integrates sound card on the motherboard isn't good.

Build Parts

CPU: AMD Phenom II X4 840 3.2GHz 95W AM3 - 105$

Motherboard ASRock 770 EXTREME3 AM3 770 SAT 6Gb/s USB3.0 ATX - 77$ or ASRock 870 EXTREME3 AM3 870 SATA6Gb/s USB3.0 ATX -$90

Ram Kingston 4GB (2 x 2GB) DDR3 1600MHz - $55 Might get 1 more of this later to get 8gigs of ram or just buy Kingston 8GB (2x4GB) DDR3 1600MHz - $95

Hard Drive WD Caviar Blue 500GB Sata III 6.0Gb/s - $40

Video Card Sapphire Radeon HD 5850 1GB - $150

Case Sentey Optimus Extreme 2x120mm 1x140mm 1x180mm fans - $60

Power Supplies These are 2 power supplies ive seen but i don't know what to get. If theres something better than these please tell me. Silverstone 500W 80PLUS - $60 or Seasonic S12II 620W 80PLUS Bronze - $77
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More about need choosing check build
  1. For the RAM you can get one of these
    http://www.newegg.com/Product/Product.aspx?Item=N82E16820231438
    http://www.newegg.com/Product/Product.aspx?Item=N82E16820231427

    For the PSU you can get the Seasonic 520 or 620, Antec Neo Eco 520 or 620.

    CPU + mobo
    http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.644858

    You don't need an aftermarket cooler. You can add RAM later.
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