GG-MAN

Hello everyone, I am in desperate need of some information for a new graphics card. about a year ago my parents bought me a new personal computer. Now this computer worked more then fine for me, until some new games like Crysis 2 and now the Battlefield 3 beta came out. These games really shocked me cause of my extremely low fps on low quality video settings. My computer has the following properties: Packard Bell 'ipower' G3720 Intel core i7 CPU 4,00 GB RAM Nvidia GT 330 500W peak wattage, 450W max wattage. as it seems the graphical card is bad, though the processor does not seem to be a problem, according to my friends, who are more knowledged about hardware then I am. What is the best graphics card that is compatible with my PC? I'd like to spend something around 200 euro max. Im satisfied with ANY kind of help. PS, If I forgot some important information to add, please say so.