How about some HoI2 with expansions? Or the latest Heroes of Might and Magic with expansions? There is a thread resurgence for Space Rangers 2 as well, and several other turn based games come to mind too if you need more.
If an older game is okay, why not some Fallout 1+2 so you're prepped and ready for 3 this year.
EDIT: Save yourself a trip to the store. Check out either Steam, Stardock, or GamersGate.