Building first computer - Need advice on PSU

First time building a computer and I need advice on how many watts my PSU should have. So far I plan on buying:
ASRock B75M mobo
i5-2400
GeForce GTX 560
Corsair Vengeance 2x4gb
4 case fans (and maybe some lights)

Is a 500W psu enough? Do I need more or would less work?

I would also like any advice. I have a case, a monitor, keyboard/mouse, hdd, etc. and I have $600 to spend on the cpu, gpu, mobo, psu, ram, and anything else I need. Are the things I listed good enough for a descent gaming rig?
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  1. Check out my $650 build
    http://www.squidoo.com/electronicandmore
    Since you don't need the HDD, that's $80 saved.
    Switch the PSU to this one and save $15, it's more than enough.
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139026&Tpk=CX430
    Assuming you don't need the case either, that's another $60.

    Finally, with all the money saved. Switch the GPU to the 7850 and youl'l be more than solid.
    http://www.newegg.com/Product/Product.aspx?Item=N82E16814150608
  2. http://www.newegg.com/Product/Product.aspx?Item=N82E16813157256 $62.99 FREE SHIPPING
    ASRock H61M-GE LGA 1155 Intel H61 HDMI Micro ATX Intel Motherboard

    http://www.microcenter.com/single_product_results.phtml?product_id=0348766 $59.99 + .99 shipping
    Antec High Current Gamer Series 520W ATX Power Supply

    http://www.newegg.com/Product/Product.aspx?Item=N82E16820231425 $25.99 FREE SHIPPING
    G.SKILL Ripjaws X Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL9D-4GBXL

    http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.937015 $94.98 save: $13.00
    Seagate SV35 Series ST3500411SV 500GB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive -
    ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner - Bulk - OEM

    http://www.amazon.com/EVGA-Superclocked-Mini-HDMI-Graphics-01G-P3-1463-KR/dp/B0050I1PGU/ref=pd_cp_pc_3 $169.99 & this item ships for FREE with Super Saver Shipping
    EVGA GeForce GTX 560 Superclocked 1024 MB GDDR5 PCI Express 2.0 2DVI/Mini-HDMI SLI Ready Graphics Card, 01G-P3-1463-KR

    http://www.newegg.com/Product/Product.aspx?Item=N82E16819115077 $124.99 FREE SHIPPING
    Intel Core i3-2120 Sandy Bridge 3.3GHz LGA 1155 65W Dual-Core Desktop Processor Intel HD Graphics 2000 BX80623I32120
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