Best Performance GTX 680

What Card will give me the best Performance in the most demanding games on ULTRA like BF3 Crysis 3 and Metro2033

Would like a FPS of around 75 - 90 in Battlefield 3 ?

Budget 500 £GBP

Been looking at these 3 cards ?

1. http://www.scan.co.uk/products/4gb-gigabyte-gtx-680-oc-...(x16)-6008mhz-gddr5-gpu-1071mhz-boost-1137mhz-core

2. http://www.scan.co.uk/products/2gb-msi-gtx-680-lightnin...

3. http://www.scan.co.uk/products/2gb-asus-gtx-680-directc...(x16)-6008mhz-gddr5-gpu-1137mhz-boost-1201mhz-cores-15


My PC specs

Case > Corsair Vengeance C70 Black
CPU > Intel Core i7 3770k @ 4.5GHz
GPU > GTX 660ti (ATM)
RAM > Corsair Vengeance 16GB 2400Mhz
Motherboard >Asus Sabertooth Z77
Hard Drive 1 > 2TB WD Caviar Black
Hard Drive 2 > Corsair 240GB SSD
PSU > TX 850w
Monitor BenQ XL2420t