Modern Warfare 2 will be out, so you can get that.
For strategy games, I don't believe there are any new ones coming out before you will build. As far as the recent ones go, the only decent one is Warhammer 40k: Dawn of War 2, and possibly Red Alert 3 if you are a C&C fan. If you decide to get dawn of war, be prepared to lose over and over and over again when you first start. You lose a lot at first in all rts games, but this one is particularly unforgiving. One little mess up in the early game can easily cost you the entire game.