Need a new GPU

Budget would be 200-300 euros.

My current pc:

Acer Aspire M5300
GPU: NVIDIA GeForce GT 230
Processor: AMD Phenom II X4 820 Processor (4 CPUs), ~2.8GHz

I really don't know anything about computers (which is why I bought a prebuild computer).

Help.

edit: friend suggested this
http://www.geforce.com/Hardware/GPUs/geforce-gtx-560/performance/Call-Of-Duty-Modern-Warfare-2-GeForce-GTX-560-OPS
opinions?

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