What resolution do you play at and what is your budget? You may also need a new power supply if the one that is in your PC isn't very powerful, which could very well be the case for more powerful video cards.
geforce 550 ti is decent, but you still need a power supply that has at least one pci-e connector. i would recommend the 6770http://www.newegg.com/Product/Product.aspx?Item=N82E16814131434or if you want dirt 3 with the card then this onehttp://www.newegg.com/Product/Product.aspx?Item=N82E16814125387. You should still check that your power supply is what you say it is.
If you already have this machine or are getting it prebuilt, I would run with it and see if you are satisfied with the performance. A gt520 is 'ok' for casual gaming if you don't absolutely need to run at max settings.
Otherwise, I would recommend the gtx 460 - which is pretty mainstream, affordable, and runs just about anything. Best way to judge a video card is through review sites (benchmarks more specifically, try toms hardware or guru3d).
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