Julie and I picked up Settlers 7 this week. She's been a massive fan of the Settlers series since Settlers 1, and we've played a few of them since we met. Settlers 7 is the latest, prettiest edition of it, and is great fun. Being able to win through a variety of condition is great, and we enjoy taking different routes to victory (I usually amass a large army, she goes the research and religion route).
The game is fantastic fun, and is on sale at half price on Amazon at the moment, because it's had appalling reviews, largely because of the utterly shit DRM that's on it. Basically, it needs an always-on internet connection to work. Which is absolutely fine for the pair of us, but makes playing it on the move impossible, and caused major problems in the first few days when the DRM servers went down under the load. Other than that, if you like resource management games then I highly recommend it. Julie and I have been playing cooperatively against AI opponents, and slowly ramping up their difficulty as we get better at the game. So far she's doing much better at it than I am, but then she usually is with strategy games (she also kicks my arse at Warcraft 3).