My first loves were Runequest and MERP/Rolemaster, both of them systems I've always thought of as way better than AD&D.
Second loves, were (and still are) Call of Cthulhu, Vampire: the Masquerade and Fanhunter (a Spanish Cyberpunk/Farenheit 451/Slapstick rpg). I've played and run many more, but...