Which receiver(s) has the best implemented iOS controls? At the very least, I need to be able to change sources/volume/pandora stations remotely. For example, I want to be able to be sitting in Zone 2, within wifi range, and be able to change stations/volume/mp3 tracks remotely.
I have posted many screenshots of ORemote for Onkyo AVRs over the last few months, I think it is brilliant. i use the dedicated iPad version and iPhone one, which seems a little cluttered after iPad, but fine for basic controls like you mentioned.
Very impressive, and the developer is constantly improving - to requests too.
Such as deleting unused Listening Modes etc.
The Onkyo may need looking at in detail if Zones are very important, as there are limitations on controls and a couple of bugs been filed to Onkyo.
Things like random not working correctly (I think in Spotify) and I think you have to do set up in Z1 then switch Z2 to Net.