Graphic cards I should buy?

Which should I get? nVidia 8600, GT240, or better, or ATi HD2600? Why I am asking, I bought a crappy game that everyone said it is called Breach, it's a combination of CoD and Counter Strike, but when I play it, everything is all LAGGY! But I also plan to play CrossFire on my soon to be new graphic card, so which one should I buy?

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