I voted for the GT Holy Trinity, Red Rock Valley, and Apricot Hill. The latter is probably my favourite fantasy circuit in the whole genre. RRV would give the Gr.1 cars somewhere more appropriate to play. The Trinity? I mean, they're untouchable, and so long as they aren't seriously altered, I want to see them in GT Sport. It feels strange playing a GT game without them. Bring back the pre-GT4 mid-track corner complex on Grand Valley, though.
I seriously considered both El Cappy and Seattle over RRV. But Cappy is largely covered by the new fantasy tracks in Sport IMO, and Seattle just wouldn't work in a Group-focused racer with its ridiculous jumps. SSR11 was an option too, if only to remind folks that PD could make an excellent walled-off highway track when it wanted to.