How much can I get for a 1998 Cadillac Deville?

[Dennis R]

I have a 1998 Cadillac Deville with 120k. I used it co commute every day, 100 miles a day to and from work on the highway. It is black inside and out, its been very well taken care of, leather still looks new, few scratches on the body. It is a northstar but the entire cooling system has been replaced and pressure tested with no leaks. I also just performed a major tune up. Everything is in good working shape, even the heated seats. What can I realisticly get for it as a private party seller? Kbb is between 3-3500