Assuming you can write up a decent CL ad and take good pics, and live near enough a population center to have a decent market, I would start at $3,500 and see how many responses I got. You can always write a new ad and reduce the price until sold.
I bought my '98 with 120k in 2009 for $4,200. I think it is in very good condition (a 7 out of 10). I have seen very few cars that are more than 10 years old that I would describe as excellent condition.
That being said, I think the newer Odys are heavy, complicated, and some years are more trouble prone. I think the simplicity of having two back doors that swing out is an advantage. I just took 5 people skiing for two days, and got all the gear, skis etc. in the car with room to spare. It drives great in snow (within reason) and got 26 MPG in mountain driving. As I understand it, the '96 and '97 are even more bullet proof, and get as good or better MPG, than my '98, which has been almost problem free.
But you have enough late '90s Hondas to know if you like them or not, so I'll get off my soapbox. Good luck with your sale, and your next ride.