I would go with Toradora! as well. I find it very rewatchable because it's predominantly character-driven rather than plot-driven, so you can watch it again for the wonderful character interaction even if you know what's coming. In fact, knowing what's coming can give you a different perspective on things. I've rewatched quite a few series, but I think Toradora! is the only one that I've watched three times.
100% of information in signatures on this forum involving percentages is false. If you feel as cheated by this atrocity as I do, don't you dare copy this into your signature.
Hold on... if this percentage was correct at the time of print, that means the actual percentage of false information is less than 100% if this signature is included. Which means that... no! I've become a slave to the system!!