If you're sticking with Harmony (sorry guys), add one more vote for the IR repeater.
For what you're trying to accomplish. It's the best solution...
You don't mention your equipment, so keep in mind plasma/LCD friendly receivers if you're using such a display. Stray IR from those panels can reak havoc on IR systems.
....Light travels faster than sound. That's why some people appear bright until you hear them speak.
