Personally I'm not a fan of open cars, it might be due to the amount of rain we get in the north east lol, but I would make an exception for one of these.
Forza 288 had one for sale a while back, I've no idea how much it went for, when I enquired about it they didn't seem to know much about it and had no idea of how much it was worth.
http://www.forza288.com/ferrari/mondiale-500-sd/
One was up for sale for £35k ages ago.
There was a write up on the car in the December 1986 edition of Kit Car magazine.
Here are some videos of a car in Holland and of Stan Daniels personal car in white. Enjoy
https://www.youtube.com/watch?v=FuJRXsgZSIw
https://www.youtube.com/watch?v=xhvHyTdg6TI
https://www.youtube.com/watch?v=FcE4kg8aHsI
https://www.youtube.com/watch?v=CCL-SNrT5ho
http://www.youtube.com/watch?v=Tr2UIeqI-9c
Neil