I love Skyrim. Lot's of fun, like the world, love Lydia, but it'll never be Oblivion. Maybe it's the nostalgia I get whenever I hear the them music, or that moment when you face off against the giant slaughterfish, or the confusion of being contacted by Lucien and having no idea who you killed, but there was just some magic (mysticism, anyone?) that Oblivion boasts that will always keep it close to my heart. DB will always be Dark Brotherhood to me, not Dragonborn. In terms of mods... well, I am usually a console gamer, and just installed Oblivion a few days ago. I've played it on the 360, but the realm of mods is new territory for me, so I don't have mush to day in that regard. Maybe 'A Brotherhood Renewed' if you like the assassins?