That kinda depends on your monitor.
You have the horsepower, so if you have the monitor try 1600x1200 32 Bit color.

Downgrade the resolution if your monitor is smaller than 19" or so, or if it won't do high resolutions. (Mine wont) If you get down to 1024x768 or so because of your monitor, try turning on FSAA in your vid card's advanced properties. Pump that as high as you can and still get good performance.
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