Klimt: You asked above about using MULTIPLE power-line adapters.
I just replaced my ASUS single port Ethernet over power-line connection with another device that provides 4 ports (Linksys Power-line AV 4-Port Network Adapter Kit, PLSK400, $60 from Frys). This enables me to plug in my Oppo 105 and Roku 3 direct with no switch box. This means each device has a direct connection (no switch box).
As you requested, the 4-port Linksys will enable you to plug in your computer, Oppo (for audio) and Samsung Blu-Ray player (connected to your flat screen). If needed, you have one remaining port.
I just replaced my ASUS single port Ethernet over power-line connection with another device that provides 4 ports (Linksys Power-line AV 4-Port Network Adapter Kit, PLSK400, $60 from Frys). This enables me to plug in my Oppo 105 and Roku 3 direct with no switch box. This means each device has a direct connection (no switch box).
As you requested, the 4-port Linksys will enable you to plug in your computer, Oppo (for audio) and Samsung Blu-Ray player (connected to your flat screen). If needed, you have one remaining port.