Can't believe nobody mentioned Banished yet. Its a game similar to Rise of Nations/Age of Empires type of games. Its a "city building strategy game". Looks really promising and its developed by 1 person, literally. It comes out Feb 18, 2014. The developer said it'll be around $20. Heres some footage.
Banished for download $19.99 - GOG.com
Banished on Steam
Shining Rock Software
Also, heres a pre-release LP. Spoilers obviously.