Spa and Monza have been favourites for most people but here is my oppinion.
We have AS3(national) which has long straights followed by tight corners also including a near identical corner to monza, so for me this is fine.
Spa, well now we have AS4+5 and to me this is very "Spa-ish".
Dont get me wrong Spa and Monza are amazing circuits, infact they are both in my top ten, but i just cant see the point in asking for more of the same, well thats how it is in my eyes.
Thats my thoughts. Jake!