Thanks for the input guys. I'm leaning towards the 7950 but I'm wondering how much of an upgrade I will notice.
For Crossfire to work do you need the exact same make and model? For example I have a factory OC Saphire 5870... do I need that exact model or can I substitute a XFX version?
Also do you think its worth it to overclock my CPU? I hear people can easily push them to 4.0 with an aftermarket cooler such as the Hyper 212 EVO.