Ditto on the source input as far as lip sync. You could try a calibration disc if you wanted to get a reference setting, but different channels, dvd's, etc will offer different sync. I know, its totally stupid.
I also just got a refurbed Onkyo 805. Only using it as a pre/pro. Only issue I have run into so far is popping when skipping a track. I didn't notice it until later as I usually just watch beginning to end, but I was trying to see about audio setup and was skipping to more audio-laden tracks... its pretty annoying, but OTOH its a lot of machine for $600.
Anyone know if popping may damage my speakers? or is it harmless, albeit annoying, thing...