Well, according to the charts, on a resolution of 1280x1024 and default quality, the 260 should be getting a score of 7100ish. I can guess that the score is in line with that.
The real question isn't how it does in a synthetic benchmark. How does it perform in the games you play? If the computer plays everything fine, you don't need an upgrade. If it doesn't, then you should consider either adding a second 260 in SLI or picking up an HD 5850 (or higher).
Well, in games like GRID i can get 180 FPS at high details. Is that a good performance?
I really want wait for the Fermi's performance and take a desition about ATI or nVidia. Depends of the performance comparation, I would get a M4A79T Deluxe or Crosshair III for CrossFire 2x5850 or the same mobo but only with a nVidia GPU.