A few suggestions:
* Baldur´s Gate 2 (if you consider RPG as strategy)
* Hearts of Iron 2 Armageddon (as mentioned by others, it is a WW2 geek wet dream)
* Roller Coaster Tycoon 3 (manage a theme park, not as deep in strategy but fun)
* Galactic Civilizations 2: Twilight of Arnor (you have to get Gal Civ 2 with the two expansions to get the full experience!)
* Sims Complete Collection (why not manage little sims instead of tanks? Not only for little girls, but fun for everyone...)
* Silent Hunter 3 (can you survive the Battle of Atlantic?)
* IL-2 Forgotten Battles (Fight it out in the WW2 skies)
* Worms Armageddon (the most online fun you will ever have! More strategy than it looks like at first sight...)
* Football Manager 2009 (why not manage a football team instead of an empire for a change?)
* Blitzkrieg (glorious WW2 RTS fun!)
* Pirates! (play the beloved classic!)
* Zoo Tycoon Complete Collection (manage a zoo, cute and fun, a bit shallow perhaps)
* Capitalism 2 (the ultimate business simulator!)
* Rise of Nations (the best and most epic RTS ever!!)
* Morrowind (the most ambitious and epic RPG ever made!)
That would keep you occupied for a few weeks...
* Baldur´s Gate 2 (if you consider RPG as strategy)
* Hearts of Iron 2 Armageddon (as mentioned by others, it is a WW2 geek wet dream)
* Roller Coaster Tycoon 3 (manage a theme park, not as deep in strategy but fun)
* Galactic Civilizations 2: Twilight of Arnor (you have to get Gal Civ 2 with the two expansions to get the full experience!)
* Sims Complete Collection (why not manage little sims instead of tanks? Not only for little girls, but fun for everyone...)
* Silent Hunter 3 (can you survive the Battle of Atlantic?)
* IL-2 Forgotten Battles (Fight it out in the WW2 skies)
* Worms Armageddon (the most online fun you will ever have! More strategy than it looks like at first sight...)
* Football Manager 2009 (why not manage a football team instead of an empire for a change?)
* Blitzkrieg (glorious WW2 RTS fun!)
* Pirates! (play the beloved classic!)
* Zoo Tycoon Complete Collection (manage a zoo, cute and fun, a bit shallow perhaps)
* Capitalism 2 (the ultimate business simulator!)
* Rise of Nations (the best and most epic RTS ever!!)
* Morrowind (the most ambitious and epic RPG ever made!)
That would keep you occupied for a few weeks...
