That sounds right for your setup. I get 6000 with my setup. The ONLY way to improve that score is to overclock your 8800GTS and CPU (oc-ing memory will help slightly as well).
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E8200 @ 3.576GHz with GA-P35-DS3L
2900 Pro, flashed to XT, oc-ed to 850/1860.
Crucial Ballistix Tracers PC2-8500 2GB
Enermax Modular 620W
Creative Audigy 4
2x Seagate Barracuda 250GB
Jeantech Nitro case, XP Pro and 19" LCD
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