Here are some great European comics.
Zoo: trilogy (Frank/Bonifay)
Meccano: complete series (Hanco Kolk)
The Chninkel (Rosinski/Van Hamme)
Pin-Up: first trilogy (Yann/Berthet)
Samber: first tetralogy (Balac/Yslaire)
De Onnoembaren: complete series (Yann/Conrad)
Mister Johan: complete series (Dupuy/Berberian)
Soda: complete series (Gazotti/Tome)
Lanfeust: original Troy-cyle (Arleston/Tarquin)