It doesn't really matter which GeForce6 6800 GT you upgrade to, some may have nicer/more quiet fans, but its basically all the same. Only real things to differentiate between cards are price, software bundle, and the color of the board.
And from what I understand, just about every 6800GT can be overclocked to GeForce6 6800 Ultra speeds.
And you will definately notice a very big difference between your current card and the 6800GT. Its probably 2x-3x faster in every case with much better image quality. Moreover, it supports Directx 9.0c, so it is relatively future proof.
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