I'm a big fan of ADAC suggestions, even if it is all in 'foreign'. Plenty there for anyone who fancied an Eifel tour.... And there's plenty that do. I've not had a go yet at downloading the routes as GPS files but I guess it works??
The ADAC maps from the FIM website were a staple basis of many a happy tour.
Easy to download and print onto a single page A4 for the tankbag - plug some towns on the route into the GPS and off you go. http://www.fim-europe.com/index.php/touring/european-maps