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:,

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

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

    CPU + mobo

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