1. Monza 2. Brands Hatch 3. Bathurst 4. Daytona Road Coarse 5. Rome Reverse 6. Redbull Ring 7. Nurburgring Nordschleife
After much deliberation, here are my picks: Brands Hatch GP Daytona Road Nürburgring Type V (endurance round) Red Bull Ring (weather round) Motegi Road Course Mid-Field Reverse Rome Reverse (sprint round)
A quick look through the suggestions, Red Bull, Brands and Midfield seem dead certainties. Lots of other frequent mentions, should be an interesting final list.