I'm thinking that the 260 is the best one put here, but just a heads up, if you choose something else, steer well clear of asus video cards.
Asus make awesome motherboards but their graphics cards are frankly terrible. I am kicking myself now for getting 2 asus 8600GT silent's and not the 8600GT fatal1ty silent's, could have got kick ass better performance and only a little more cost, an extra £10 or so.