Graphics card help

Hi I want to buy a new gpu:My system is:
Motherboard: Asrock775Dual Vsta
Cpu: Intel Core 2 Duo E6300 1,8 GHz
Psu : 450w
Ram:2x1Gb DDR2
I'm running windows 7 Ultimate
Gpu:Nvidia FX5200
Screen Resolution: 1920x180

I decided to buy a nvidia GT440 1gb DDR3 graphic's card but I don't know if it 'll be compatible with my system (and specifically with my motherboard),will you help me?

In case it;isn't will you suggest me some graphic's cards around 50$?

Thank You

"Sorry for my English"
 
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