Replacing my video card, or possible other upgrades, help appreciated!

Hello everyone! So not too long ago one of my two video cards died on me. As of now, my specs are an Intel Core Duo E6850 @ 3 GHz, 4 GB of ram, and an NVidia 8800 GT, and the monitor I'm using runs at 1920x1200. With all the new games coming out soon, including Mafia 2, Dragon Age 2, and Final Fantasy XIV Online, I'm looking to either replace the 8800 GT that died and go back to running SLi, or get a new video card that can out perform both of those. I'm not insanely computer literate, I had a great deal of help building this computer from a friend, but he isn't in the position to help me out at the moment, so I ask, what would be my best decision to go with? I'm certain buying the 8800 GT would be the most cost efficient, but if a much better card is available and not that much more expensive, then I'd gladly do that instead. Note I am partial to NVidia, as I've always had cards by them and like the interface, as well as the physx and such. And finally, would the video card be the best idea? Or would upgrading something else before hand be the wiser choice? Thank you very much for any and all assistance that can be offered, it is much appreciated.

well i think the gtx 460 would a be a good idea, its about 200 dollars and it has DX11 too great bang for your buck at that price.megapikachu101

Awesome, thanks a lot to the both of you, really appreciate the help. Just to clarify though, will a single gtx 460 outperform 8800's in sli? I can't afford to get two at the moment, but maybe after classes start up again I can. Thanks again, appreciate the replies.