... Now what?

Resident Evil is behind me. I got a used copy of Resident Evil Zero and beat that in only a few days time, it being possibly the easiest of the RE games (and I thought REMake was pretty easy, too). Final Fantasy VI Advance is about to wrap up; as per usual, I'm putting off the final confrontation with Kefka for as long as possible.

So, now what?

Only a few weeks remain before the release of Super Paper Mario (followed by the releases of Pokémon Diamond and Pearl), so what should I play in the interim? I'm not about to start on Final Fantasy XII just yet; three weeks seems like not near enough time to invest in it, and I hate interrupting a large game and jumping back into it later. Instead, what classic games should I revisit, or what hidden treasures are out there that I have yet to play? I'm open to any and all suggestions.