Sapphire HD 6870 vapor X vs MSI GTX 560 TwinFrozr II

APPROXIMATE PURCHASE DATE: 1-2 weeks from today

USAGE FROM MOST TO LEAST IMPORTANT: gaming

POWER SUPPLY: not sure what to get for either of these two cards

OTHER RELEVANT SYSTEM SPECS: Intel Core i5 2500K Quad Core Unlocked Processor LGA1155 3.3GHZ Sandy Bridge 6MB
ASUS P8P67 LE B3 Intel P67 Motherboard

PREFERRED WEBSITE(S) FOR PARTS: www.tigerdirect.ca or www.canadacomputers.com

PARTS PREFERENCES: No preference.

OVERCLOCKING: Yes. MAYBE I will do Crossfire/SLS later on

MONITOR RESOLUTION: 1920x1080

ADDITIONAL COMMENTS: Must run newest and best games (I.E. STALKER COP, Crysis, BFBC2 on highest settings).


The debate i'm having is between these two cards:

The Sapphire 100314VXSR Radeon HD 6870 Vapor-X Video Card - 1GB, GDDR5 link

and the MSI N560GTXTwinFrozrII/OC GeForce GTX 560 Video Card - 1GB, GDDR5 link

I'm not too familiar with the specifics of GPU's so I would really appreciate some input   . I want to get as many people's opinions as possible before I waste my hard earned money.