I'm thinking of buying and connecting a Panasonic DVD-S77S to my new 37" Panasonic plasma to take advantage of upconversion. My Onkyo A/V receiver (TX-SR703) doesn't have HDMI inputs. If I connect an HDMI cable from my DVD player straight to the TV just for video, can I also connect a digital optical cable to the reciever at the same time for audio? I'm using component cables for video on an older Sony DVD player now, along with the optical audion cable, which sounds great. By the way, will I see a big improvement in DVD PQ by using a DVD player with upconversion? Thanks!