I'd remove ST now. You had it already. You will get tired of it again. Hobbit and DI are great. New Hobbit code has put new life into the game, and don't let people tell you it's slow. It starts off slow (just like the movies,), and then goes nuts later on. It's an adventure and will provide much variety opposite your Metallica. DI is apparently an instant classic (haven't played it) and that says a lot, but again you need to play these games if possible to really decide. I voted Hobbit because our family loves the theme, we love the simple rules, the beautiful Machine itself, and it's fun to progress through. I'm sure DI is awesome and would be a great choice to.