Best budget graphics card?

[Nonorz]

I am looking to buy a new graphics card for my desktop but honestly have no knowledge of what are good graphics cards at a reasonable cost.

System Info:

HP-Pavilion
BK275AA-ABL p6402f

Pentium(R) Dual-Core CPU E5400 @ 2.70GHz (2 CPUs), ~2.7GHz
6144MB RAM (PLUS 4GB ON A READYBOOST USB)



If you need anymore of specs tell me, I'd really appreciate the help. Also I'm looking under $100.

 

[Nonorz]

My goal is to run The WarZ at a good FPS and appearance

 

[computernoob29]

how many watts is your power supply?
the only thing in that budget would be a 7750, that might be the only card that you can use with your power supply anyway