As stated earlier, my view is that Fuji is the best alternative - scratch built & completely legal, well built, plenty of slots, night support, applicable to LMP/GT racing, etc. None in the vote interest me in the slightest, personally.
Dont think its good to add a completely new track to the download list that nobody has ever driven, most default tracks people ran on before or know them from real life
Bram if you used FSR Spa, Dave/Shaun can provide a download link for everyone.
I voted Silverstone from the list.
Feel free to upload it: http://forum.racedepartment.com/downloads.php
then we can have a look, what are the origins of that track?