Okay dencraig, I suggest using the kexts I listed only based on my experience. my ethernet did not work without it however with it I am able to print to a printer on a windows machine 3 routers deep.
Okay now for Audio. I am attaching my dsdt.aml file. I have patched it for basic fixes.
RTC - cmos reset fix
DTGP - required for all fixes applied through dsdt
Hdef - this will be your audio.
Step one download and install this dsdt.aml put it either in your root folder or the extra folder(mine is here)
Step two remove voodoohda if installed and reinstall AppleHDA if you removed it. Install the LegacyHDA attached into you Extra/Extensions folder(just drag and drop the run Kext utilty.)
Step three repair permissions
Step four go to system preferences and sound. then select internal speakers I know this may not be a accurate description but who cares if it works.
Please report back may require a restart. Please note both files needed are attached below.