I just saw Divinity Original Sin on sale on Steam. What do you say? I have heard good things about it.
Divinity is an excellent game all around, if you like RPG's it will satisfy. It is turn based, and designed to be played with 2 people.
It is the game I've been playing with my SO, and we are loving it.
Other then that Diablo 3 or Torchlight 2 would be my advice, both games are a lot of fun and easy to pick up and play for a little while, and then come back to later. Of the two I prefer Torchlight 2, it is more cute and funny as opposed to Diablo's dark and gloomy, but I have not played Diablo 2 since they fixed the loot system.