Need suggestion

[ultimatum_41]

APPROXIMATE PURCHASE DATE:January of 2013USAGE FROM MOST TO LEAST IMPORTANT:Gaming(Metro 2033,GTA4,BF3)
CURRENT GPU ANS PSU:Gigabyte geforce gt640 and Super Power 600 W
OTGER RELEVANT SYSTEM SPEC:CPU:C2D E7500,Intel Motherboard
NO OVERCLOCKING,CF AND SLI
MONITOR RESOLUTION:1600X900
BUDGET RANGE:90-180$

Hi guys,i need some help to choose GPU.I dont know which is better between this 4 GPU.>HD6850-HD7750-HD7770-GTX550TI<
Can anyone suggest which is better

 

[jsrudd]

See this guide

 

[ultimatum_41]

Best answer selected by ultimatum_41.