It outputs DD 5.1 and DTS bitstreams, not HD audio. If you want HD audio, and your receiver has HDMI inputs, you need to look at the 500. It has dual HDMI, one for video and another for audio on receivers that can't handle 3D, just like yours.
Why are you interested in the 320 instead of the 220? Not many people like the touchpad remote on the 320.