Hi Salazar,
Still no go yet. I am waiting for the 790GX mobos, should be out end of this month. Not that I really need it as the 780G should be sufficient for HD playback. Depending on the pricing (I think its roughly about £40 difference).
What is your main HD material do you play? HD DVD or Blu Ray? Have you used AnyDVD HD before? My colleague recently built his HTPC and had a lot of issues with HDCP/HDMI, he said installing this resolved a lot of his issue, probably not the lip synch issue you have.
www.slysoft.com
Will keep you posted once the PC is built!!