Descent or Twilight Imperium?

I should have put Dungeon as a classic on my list of awesome analog games yesterday. I feel like a real idiot for leaving that one off.

Has anyone played Descent? A lot of the guys at BGG like it, and it seems like it could be right up my alley; sort of a venn diagram of Dungeon, Heroquest, and Talisman.

Bonus question: if you could only get Descent or Twilight Imperium, and you realistically could only play with three people total, which one would you get?

Double Bonus: Ryan isn't as into the geeky games as I am, but Nolan really, really is. If you could only pick out one two player game that isn't a CCG and plays really well with two players (not like "I can do this with two players, but it really plays better with four) what would it be?