Traditionally films on my to see again list are better phrased as films I slept through the first time. I shamefully admit to sleeping through parts of probably every Tarkovsky film the first time around. I'm a little dismayed at your thoughts on Solaris, considering I think its his best film, although I'm a bit of a minority on this site for that. Of Fellini's films, I'd say 8 1/2 is the film that offers the most out of multiple viewings, and that's not just because its my favorite foreign film ever. Its much denser and multi-layered than his other films and therefore has more to pick at.