Wow, any DINFIA Graciela-stuff would be great, for sure a much bigger rarity than the Belgian price list and British sales brochures and advertises from the Wartburg, I've digged out on the Dutch markets. From those yWou can buy anything, which is in collectable condition for reasonable prices.
50ies and 60ies stuff for fair prices would be great, too. About the newer Ford-stuff, Taunus and Sierra I'm not sure. I don't know, how crazy the Ford-freaks are. Aircooled VW-stuff is always good, Porsche even more. You can sell any Porsche-containing for good prices over here.