Upgrading system; need help

i am trying to upgrade my Dell Inspiron 531 with completely stock parts to something that can run any game fairly good. i don't want to pay a ton of money, and i don't want to get all new parts all at once. i was going to start out with a new PSU and graphics card. i will link some that I am thinking of and I just need to know if they are compatible:

graphics card 1 - http://www.bestbuy.com/site/EVGA+-+GeForce+GTX+550+Ti+1GB+GDDR5+PCI+Express+2.0+Graphics+Card/2843116.p?skuId=2843116&id=1218356318281#tabbed-customerreviews

graphics card 2 - http://www.newegg.com/Product/Product.aspx?Item=N82E16814130749

powers supply - http://www.newegg.com/Product/Product.aspx?Item=N82E16817341016&nm_mc=OTC-Froogle&cm_mmc=OTC-Froogle-_-Power+Supplies-_-OCZ+Technology-_-17341016

i really appreciate any help!
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