There isn't one.
Additionally, you might want to do your own research before you let random internet folk dictate how you spend that much money....
Random internet folks such as myself are happy to dictate how people should spend their money for graphics cards.
The topic creator needs two GTX295s for rudimentary SLi (get four of them for good quad SLi),
and needs two 4870x2s for basic Crossfire (again, get four of them for good quad Xfire).
He shouldn't get anything less than the GTX295 or 4870x2 or he won't even be able to play old games such as Crysis on low resolutions such as 2560x1600.