as a super s its already a good selling point, and from the looks of it, compared to my slx your car is in great condition and I would love to buy it but santa forgot to give me 3grand for christmas...
I suggest getting more pictures, take time to make car look good but also be honest about its condition, take engine pics etc, let us know if its all red or the bay and interior paint is different.
No matter what, for a series 1 super S in good driving condition, 3grand should be your minimum, definitely don't trade it in for 2grand at a dealer.
Full description, more pics, good price and it will sell soon enough.