I've only seen a few, but I always go back to Vegas to see "O" and "Mystere". I love "O" and everyone else other than my cousin liked it alot. Plus the music is great.
2008 European Tour
London: Les Mis, Lion King, Sound of Music, Joseph, Hairspray, Billy Elliot
France: Le Roi Lion, Cabaret
Germany: Der Konig der Lowen
Holland: Tarzan & Les Mis