Playing new boardgames with a different group on a weeknight? Scandalous!
Manhattan Project - This struck me as a well-designed game. Uranium and plutonium seem balanced against each other (uranium is faster but more money-expensive both for production and loading bombers and lower-yield, but the plutonium path is slower). A number of rules prevent the game from deadlocking (mandatory placement or retrieval, bribe pool). Was fun, would play again now that I have a better understanding of the mechanics and tactics. A little bit on the long side (about 2.5 hours I think?), but that was with some stalling plays and lots of inexperience. Overall I feel the game was well-worth the time.
Coup - I was hesitant as I expected this to be a Mafia / Werewolf / Bang style deception game, but was pleasantly surprised. Maybe I was thinking of the larger variant with Monarchist / Rebel cards. I enjoyed this game more than I expected; it is very satisfying to pull off a bold-faced bluff.