Which graphics card should I buy?

Q: I have a Dell Vostro 200 Mini Tower. I am unaware of the wattage of my power supply, but I do know there is a PCI-e x16 on my motherboard. I was looking to upgrade my graphics without breaking the bank ( am a student ) but have capability to play most modern games such as Call Of Duty 4. If you could please outline the benefits itd be appreciated. Thanks I have Windows Vista as well. I have limited knowledge on graphics card so could you please check that it'd be compatible with my system. I have a mini tower, so im guessing space is restricted. Not sure really I am not looking to upgrade PSU really, so just suggestions with PSU I have. I havent connected on of these before either so any tips and instructions would be greatly appreciated. THANK YOU SO MUCH PEOPLE!!

A: No matter what you computer wattage is the standard is 300w. Personally I've been using this card for a year and this card can play most games at the highest settings. http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3504453&CatId=1826

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