I recently purchased the Onkyo HT-770 when shopping for an audio-only receiver. For my home theater I currently have an Onkyo TX-DS575X driving a Polk satellite system. Is the receiver that is included with the HT-770 superior to the one I currently have in my home theater setup and should I use it with the Polks, and move the TX-DS575X to my audio room to use with the HT-770 speakers?