Sorry for your loss, Deb. To make sure I'm understanding it correctly, here's the basic info:
2005 Spyder in Paradise Blue with SMT and 20k miles. Well optioned and comes with a few quality extras.
It sounds like a very nice car. $18,000 seems ambitious especially given the polarizing nature of the SMT transmission, but hopefully this is the perfect combination for someone and they get you the money you need.
It would also be helpful to provide condition of the larger wear items tires and brakes. Tires are especially important because they're likely past or coming to the end of their life cycle due to age if they haven't been replaced during your ownership, and getting OEM sized replacements is near impossible now.
Best of luck with the sale!