There is absolutely NO DOUBT!! that there are Real classics!!
My favourites are e30 M3 (or 325 sport at a push), Z1, e34 M5 Touring (Nurburgring Version).
What are the modern classics (ie. People own them now!! but in twenty years you are going to bore the Pub! with the I used to have one of them!! Honest!!).
I start with:-
e46 cab (timeless)
e46 M3 (Unmolested)