How much power will I need for my computer?

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

Motherboard: ASUS P8P67 LE-R3 LGA 1155 P67 ATX Intel Motherboard

RAM: G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL7D-8GBXH

Graphics Card: 100312-2SR AMD Radeon HD 6950 2048MB GDDR5 PCIe 2.1 x16 Video Card

Hard Drive: SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive

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

Optical Drive: LITE-ON Black 18X DVD-ROM 48X CD-ROM SATA DVD-ROM Drive Model iHDS118-04 - OEM
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More about power computer
  1. 550W to 650W should be sufficient, get one that is at least Bronze 80 certified. I've had good luck with Corsair PSUs.
  2. 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.
  3. Other people have told me to use over 1 kilowatt!!! Thats 1000 watts!!!
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