Hey Brad,
I just finished a setup with 3 Sony TV's side by side and used the Xantech Ir Router (RT-8) and it works extremely well. Each TV has it's own digital cable box and the middle one also has additional components dedicated to it (DVD, TIVO, etc.). You have to get the special Xantech programming remote to control the IR router then you learn into the customers learning remote control all the router control commanands. The three systems feed into one Sony receiver that has three video inputs, this was fine for this system, but I'm not sure what is the best way to handle 8 different inputs since the amp by itself does not have that many inputs.

Good Luck
Jeff