Hi David and Welcome to Audioholics,
Pandora will play back with one of these two Onkyo models.
As for support for station's tuning, etc., it's up to your player features, like a blu-ray player with Pandora access.
What comes in must come out the same way, so the receiver willl not improve it; but with Audyssey superimposed, you'll be gaining greatly, if you know what I mean (balanced audio surround quality...).
The display is dependent of your player.
Good quality speakers from Klipsch or Polks would be just fine with either one of these two great receivers.
Cheers,
Bob