you really should upgrade. the benefits of running a single card that's as powerful as your crossfire setup is huge. no microstutter. go single card, and experience the smoothness you've been missing out on.
I don't believe I will be upgrading because of the benefits i dont have right now and the better software/hardware that would be released in a year. I.e. the ati 8000 series and the fact that my motherboard does not support pci express 3.0, or even usb 3.0. The Beta drivers fixed my crashing issue