Your plan with the RedEye WiFi plus the RedEye Mini will work and with every release of the APP the RedEye is getting more and more powerful and customizable.

One thing I do have to caution you about is regarding your plan for 2-way support with the Apple TV. I just want to make sure you realize that will be navigating from one APP to another for that. The Apple Remote App will let you change and select your music or movies on the Apple TV but you will have to go to the RedEye App to control the volume on your receiver, inputs, etc. It's not a big deal as the Apps switch pretty quickly... I'm actually doing it on an iPod touch in my own home.