How much power will I need for my computer?

[heroicevil]

I'm planning to build my own computer and I found all of the parts. But now I need to find out how many watts I need for the power supply. This is my first time, so can you help me? Here's the tech specs of my computer:

CPU: i5 Sandy Bridge 2500K 3.3 GHz Quad-Core
http://www.microcenter.com/single_product_results.phtml?product_id=0354589

Motherboard: ASUS P8P67 LE-R3 LGA 1155 P67 ATX Intel Motherboard
http://www.microcenter.com/single_product_results.phtml?product_id=0358067

RAM: G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL7D-8GBXH
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231440

Graphics Card: 100312-2SR AMD Radeon HD 6950 2048MB GDDR5 PCIe 2.1 x16 Video Card
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102928

Hard Drive: SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
http://www.newegg.com/Product/Product.aspx?Item=N82E16822152185

Case: Rosewill CHALLENGER Black Gaming ATX Mid Tower Computer Case, comes with Three Fans-1x Front Blue LED 120mm Fan, 1x Top 140mm Fan, 1x Rear 120mm Fan, option Fans-2x Side 120mm Fan
http://www.newegg.com/Product/Product.aspx?Item=N82E16811147153

Optical Drive: LITE-ON Black 18X DVD-ROM 48X CD-ROM SATA DVD-ROM Drive Model iHDS118-04 - OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E16827106276

 

[treefrog07]

550W to 650W should be sufficient, get one that is at least Bronze 80 certified. I've had good luck with Corsair PSUs.

 

[Wampbit]

Corsair 650W TX would be your best bet for that. You'd have enough headroom for OCing and upgrades with that - 550 would technically work, but you'd be cutting down on your headroom quite a bit, and the price difference isn't big.

 

[heroicevil]

Other people have told me to use over 1 kilowatt!!! Thats 1000 watts!!!