I still have this very same problem. And it mostly happens when waking up from sleep or rebooting which freezes or reboots my computer.
Stack trace is quite the same.. systemstats chrash, NSInternalInconsistencyException and 'duplicate boot uuid detected'.
I tried changing the drive UUID...
I have GA-Z68AP-D3, which should have ALC889.
I tried your DSDT mod + cleared all kext + used your kext (running 10.7.2). And it works :)
The problem is, that my mobo only has 3 ports (red, green and blue)(+2 front).
They get detected as:
internal speakers (working)
line out (not...