Here's some listings here that you should have already seen if you were looking for comparables:
http://986forum.com/forums/boxsters-sale-wanted/57912-2001-boxster-s.html
http://986forum.com/forums/boxsters-sale-wanted/58445-2001-porsche-boxster-s-24-700-miles-meticulously-maintained.html
http://986forum.com/forums/boxsters-sale-wanted/58687-2001-boxster-s.html
http://986forum.com/forums/boxsters-sale-wanted/58951-2000-porsche-boxster-%93s%94-l-n-ims-bearing-upgrade-complete-w-new-clutch-rms-aos.html
I don't know the market in your area, but in the Dallas area there are plenty of good looking S models at or below $10k.
If I had posted my original opinion yesterday, it would have been exactly what Tom wrote.
I sense from the way that you wrote your post that you feel that your car is special compared to most of what is on the market, but selling it much above market will take a special buyer. If you are not in a hurry, list it at $14,500. My opinion is that if you go much higher than that, it will be stale and frustrating.
Started at $15k (12/2014), last seen at $9,999 (9/2015):
http://986forum.com/forums/boxsters-sale-wanted/54979-seal-gray-2001-boxster-s-exceptional-condition.html