I owned a good condition 91 si. I think for a good condition it is at most 2500 bucks. The price you were offered is a rip off.

After buying the 96 prelude si, I think they are two totally different monsters. You will be happier with a 92 and newer prelude. Of course, find a stick one if you could, it makes all the difference. The newer ones are heavier, but the torque is greatly increased.