I would definitely second the recommendation for MOO 1&2! Too bad it just went off sale. :(
Other great suggestions here that I would second: HoMM3, Disciples 2, Civ III or IV, Age of Wonders series.
I enjoyed Settlers 2, but it is RTS not TBS so don't know if it might be a bit difficult to keep up with if you aren't able to use your usual dominant hand.
If you like strategy rpg and are wiling to try something a bit different from the norm some time look into:
Thea: The Awakening It's turn-based and surprised me at how many hours I spent enjoying it. With random maps and gods to choose from it is also replayable. Unfortunately it's not on sale atm.