Good games that are already out: Resistance, Oblivion and Motorstorm

Good games that are coming out: Ninja Gaiden Sigma (Next week), The Darkness (next week), Devil May Cry (october), GTAIV (october)

If you want the darkness I recommend you save up for it and don't trade Resistance for it. You might regret it one day when you have the urge to play Resistance but can't.