I use the A-S801 and as far as I can tell, there aren't any noticeable sync issues. I believe the integrated amp version gives better sound for your money too. If you can live without airplay and a radio tuner, you better go for the A-S line.
All my digital sources are connected to my TV and the TV to my amp via optical so I basically use the TV as a hub.
Of course this is just my two cents so take it for what it's worth.