Here in QLD Australia, I suppose my faves are:
Na, Nb & Nc Historic Touring Cars
Groups P, Q, and R Historic Racing Cars, a lot of Formula Atlantics, Pacifics, F5000s (if they turn up) etc. A fantastic mix of cars, and really good action.
Sa, Sb and Sc Historic Sports Cars
Also I can't wait for the return of the Group C(/A) Touring Cars in June... that'll be fantastic.