I've just started using spice via calling qemu-kvm from the command line and then connecting to the VM using spicec. The windows7 x64 graphics performance is spectacular as compared to the old SDL window but spicec is quite buggy. I files bug reports and just found out that spicec is depreciated and that I should be using virt-viewer. i looked at this and discovered that it is a HUGE palavur to move over to virt-manager from using qemu-kvm from the command line. The big issue for me is that my networking is done using VDE and it working great and trying to convert my VM using virt-manager it shows nothing for networking.
I'm not sure how to proceed here.