Looking for a good PC game to buy?

I'm a fan of sports games, the call of duty series and strategy games like Civilization. I never really buy PC games, but I'm in need of one due to an atrocious cl (i'd be using my laptop obviously)...need some entertainment. Now bear in mind I'd be playing the game without a controller/joystick (have call of duty 4 on ps3 and I know how difficult those games can be simply with a controller...can't imagine how difficult it'd be on the keyboard). I have civ 3 on the pc, so not sure if civ 4 would be any better. As for sports games...again, not sure how i'd enjoy the controllers on the keyboard...are they easy to get used to? Suggestions please! Thanks