I'm ****** off with Nvidia drivers at the moment. I won't get into all the reasons but it's mainly to do with my TV at the moment, can't get 1366x768 to work and some driver sets won't even do the slightly blurry 1360x768.
I might even skip the X2 and go for the standard 3870, depends if I feel like spending or saving really.
If i were you id just keep what you have till proper new cards come along. I see you've removed it from sale anyway.