Need Advice On GPU'S: Radeon 7970 vs GTX 670

Hey,

So i am looking to build a new computer and I am trying to decide whether I should purchase a GTX 670, or a Radeon 7970. With this computer I want to be able to play games such as CoD4, Minecraft, Skyrim... etc, and I want to be able to video edit, use Photoshop, and other editing programs. So overall i want to be able to game, as well as use my computer for multimedia purposes. What do you think I should purchase? I have heard that there is a rumour going around saying that nvidia cards are great for gaming but not so great for multimedia and Radeon cards can do both gaming and editing. Is this true?

Specs of New Computer:

Processor- Intel i7 - 3770K 3.50Ghz
Motherboard - Asus P8Z77 - V LK Socket 1155 Intel Z77 Chipset
Power Supply - Cooler Master725W Extreme 2 v2.3
RAM - 16 GB
HDD - 2 TB
SSD - 128 GB
OS - Windows 8


Links For GPU'S:

GTX 670:

http://www.canadacomputers.com/product_info.php?cPath=4...

Radeon 7970:

http://www.canadacomputers.com/product_info.php?cPath=4...


Thanks for the Help!