As a rF1 veteran:
Vitus Park(as mentioned)
Piddy(I think that was the name, so I'd finally have
a two home races! The fast-flowing turns over blind crests are even more amazing than Vitus)
Magnificient Park(the fictive story about it says it replaced Le Mans as 24 hours event, but I'd seriously drive such a race there!)
Troyton(cool track, especially with touring cars, feels as if someone put Bathurst and Monaco into a blender)
Thermalito(DDF Racer's track, he ported it to AMS and it felt great to drive during his event)
I think there are others like a different take on a Nordschleife(was that Machwerk or some other -ring track?) or something like Rattlesnake Point.
I also think S397 should update all of their fictive tracks, especially Lienz.
I'd pay for a "best of mod tracks officially supported by S397"pack with the fictional tracks above. They were just too good not to have