Thanks very much for the answers, which answered questions and yet brought out a few more.
1) Are there any disadvantages for me to leave the D Link 890L in Router mode rather than AP? You are correct that the D-Link is NOT the main host router (for the wired connection that is, as it's plugged into one of the Ethernet ports of Verizon's ActionTech, which in turn connects directly to the Verizon FIOS box, making it the true host router), but the D-Link seems to work just fine (again, I am using it only as WIFI router) in Router mode, and I believe that if I make it AP mode, then any & all Firewall settings (on the D-Link) would be ignored. Or am I wrong?
2) So if I leave the SmartConnect ON, and just run that ONE WIFI network I setup, will/does the D-Link automatically use all of its bandwidth possibilities (speed) for that network? Or should I still create a separation two network names and use the 2.4G for Internet PC/PDA/Phone usage, and then Primary 5Ghz one just for streaming to the TV? If this is the case, what happens to the alternated (Secondary) 5Ghz channel?
All I am looking for is to have the fastest possible streaming on all system and yet, have the widest signal range. I
3) Your answer to my question #5:
" I have the following Firewall settings as DISABLED : SPI IPv4, Anti-Spoof Checking -- Should I turn on either of them or do they cause slowdowns / problems?
You can enable them if you use the 890L as a main host router."
This means since the D-Link is not the main host router (and even if it's running in Ruoter mode), those settings don't do anything when turned on or off. Correct?
4) Last -- but not least -- where do I find the DHCP: Use reservations? I can't find it anywhere....
Thanks again!