I know the full list will make many wishes come true.
However, my only wish is for the 3 Shelby cars we have in FH5 (Cobra, Daytona and GT500) as this is my favorite brand, and i also own a replica by myself. 
Everything else would be then the cherry on top for myself.
Please at least the 427 Cobra!
Ooh. I have my personal Wish-thread. Didnt know thats the way to go. So thanks for moving.
Ok. Then - Dear Santa -my Cherries on top would be:
Maseratti MC12 (normal Street version, not the GT version from FH5)
1957 Chevy Bel Air
Mercedes Benz SL65 AMG Black Series (2008-2011)
1967 Chevy Corvette C3
1980 Audi Quattro
2005 Ford GT
2003 Porsche Carrera GT (with the Sound from FH3/4- not from FH5!)
Ferrar 458 Italia with Widebody kit like in FH3
1998/1999 Nissan Skyline GTR R34 (but im pretty sure that this will be In - it would be a sakrileg if not!)
All cars that we already had in previous FH games.