Upgrading a bad video card

Hello,
I have a Dell XPS 6030i with an nVidia GeForce GTS 240 with 1 GB of vRam and a 350 watt power supply. All I want to know is what type of newer card would work with my system? The system is used almost exclusively for surfing and playing games such as Borderlands, CoD, MOH and so on. The current card has played all these games great, but has now died and I am looking to upgrade. Any help would be appreciated. Thanks in advance.