Avr set up question

Im sure this has been addressed, but I cant seem to find quite the answer to my question: Should i feed my Oppo 981 thru my receiver (HK 254 ) using hdmi or send it directly to my Tv (50 in plasma) My Tv is 720p, and that is what I have the output resolution set to on the oppo. My concern is if I send it to the AVr it will be upconverted to 1080, forcing the processor in the TV to down convert back to 720. I'd like as little signal processing as possible. How do you folks hook it up? Thanks.