[Solved] Help with choosing psu for gaming

I need help in choosing a Gaming PSU with 750-900 watts. my budget for this is about $100-$200. i have one already in mind, bt im not sure if it is good enough and if there is another PSU with the same capabilities for a lower price

Corsair CMPSU-850AX AX850 Power Supply - ATX, Modular, 850 Watt, 80+ Gold Certified, 120mm Ultra-Quiet Fan

Thanks in advance! all your help will be greatly appreciated.

Before we do this, why do you need one so powerful? Tell us about your system before we start talking power.

sorry. I will be using my pc for Gaming and multimedia. i will also include some extra components such as a sound card.
I am also going to overclock so that might take a few more watts.

here are some major components I will be using:

Video Card:Sapphire 100312-3SR Radeon HD 6950 Video Card - 2GB, DDR5, PCI-Express 2.1 (x16), HDMI, Dual DVI, DisplayPort, DirectX 11, Dual-Slot, CrossFireX Ready

CPU:AMD Phenom II X4 965 Black Edition AM3 CPU HDZ965FBGMBOX - 3.40GHz, Socket AM3, 6MB Cache, 2000MHz (4000 MT/s) FSB, Retail, Processor with Fan

Mobo:GIGABYTE GA-990FXA-UD3 AMD 900 Series Motherboard - ATX, Socket AM3+, AMD 990FX Chipset, 2000MHz DDR3 (O.C.), SATA 6.0 Gb/s, RAID, 7.1-CH Audio, Gigabit LAN, SuperSpeed USB 3.0, CrossFireX/SLI Ready

I also plan to upgrade in the future so i thought i would need some extra watts.

Antec, Corsair, and XFX all make great 750W PSUs. Look at newegg and find one in budget.

Best answer selected by Anubis_Andro.