If the Popcorn Hour can communicate to an iPhone, iPod Touch or iPad you can use the screen on the iDevice na? I mean who want so squint a 4" screen from across the room (which was the point I was making with the SBT) when your iDevice can do this in your hand.
I haven't seen iDevice control for Popcorn hour - maybe it exists, I am just not aware of it.
You first have to decide between audio-only solution (SBT, Sonos etc - no monitor required for selection, easily controlled from iDevices) or audio-video solution (Popcorn hour etc - there are SEVERAL such players with different features and capabilities - but will need a monitor for selection).