Thank you for your quick responses.
BoredSysAdmin,
Forgive my ignorance in this but I don't know much about "WiFi." I assumed that's what I currently have (I just recently set it up with some help). My high speed internet cable goes directly into the router. Then my computer, telephone (Ooma) and SONOS wireless radio all plug into the router. Isn't that WiFi?
If so, what I was going to do with that last open port on the router is run one ethernet cable across the room to the Home Theater Equip., add a switch, then plug the TV (also has an ethernet port), Oppo and Onkyo into the switch.
Does that help in understanding what I want to do? I really don't care if it's wireless or wired as long as i can get them all connected to the net for streaming movies and internet radio, automatic firmware downloads from the mfg. etc.