1) High Speed Ring, Its a easy track so slightly more enjoyable then suzuka or eiger as if u push there im turned around, says more about me this then about track but this is the reason, also good it has fast and slow parts and a tunnel!
2) Suzuka GP, Wonderfull circuit, 8 figure, All kinds of corners, fast and slow en that first turn is amazing.
3) Eiger, Very nice track, difficult and fun, slightly slow but the up and down is so awesome to drive
3,5) Fuij, Has some very long corners, and the straight is just very nice
4) Daytona Roadcourse, Nice race track, saw it for the first time this january with GrandAm races, also mixed with the oval and circuit.
5) Suzuka East, Not as complete as suzuka but still fun
6) Daytona Speedway (left, and left, and left, and left, and left)
7) London (dunno its so small and short, need to drive it more to say more about it)
EDIT!: I forgot Fuij lol