To give you an idea, I just picked up a 99 indy 500 in southern minnesota with about the same mileage as yours in great shape for 1100 bucks. Granted that is a bit lower than the norm, but it gives you a comparison. Depending on your location and if you sell during prime riding time you can get more. I would say a good starting price would be about 1500 bucks if the motor is installed and it runs and drives. I would suggest E-bay...if not to sell, to get yourself a better idea of a more uniform idea of what sleds are going for. If nothing else, you can get an idea from www.nadaguides.com
click on the motorcycle tab and there will be a snowmobile link you can click on.
Hope this helps!