How long are you going for?
If you’re doing the full week, a 7″ beast will probably be useful as you will get less beaten up and then be fresher for the quali and race day.
If you’re just doing a couple of days, something smaller like a 5 will be great as most of the overtaking happens on pedally bits.
As mentioned above, dual ply tyres (tubeless) and big rotors on whatever you choose.