New Graphics Card. help.

WHAT I HAVE:
Windows 7 Home Premium 64-bit
Intel Pentium Processor E5800
Intel GMA X4500 graphics
1TB Hard Drive
3GB DDR3 Memory
Multi-in-1 Media Card Reader
I have a PCI Express Video Card slot (X16), and the Budget is no higher than 80$.
WHAT I NEED:
A PCI Express Video Card X16 that is good enough to get me at least a constant 150 FPS if possible. as stated before, budget is 80$, post links to websites selling a card that fits my description, and tell me more about the card.

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