Grail Games!

I have a list of a few "grail games"—games I really want get, but that are hard-to-find or out-of-print. One of the games on that list is Mississippi Queen: The Black Rose. It's an expansion for Mississippi Queen—itself a hard-to-find game—which is about racing paddle-boats down the legendary river. I've had the base game for years, but I often heard that it was MUCH better with the REALLY hard-to-find expansion. So I never ended up playing it. Well, a few weeks ago I was able to trade for the base game and the expansion. I can't wait to try it out with the family. Now I'm off in search of the next game on my list: The Magic Labyrinth...

What are some of your grail games?