I own a Yamaha RX-v473 receiver with built in Airplay and 3 HDMI ports with a pass-thru.all the external audio goes through that from any Apple device in the house.
If you're looking for a new receiver with power check into it.
i have the B&W A7 in my bedroom, it's a bit pricy, but the sound is nice. nice and full sounding, good bass. but about $650
the remote isn't the best, its' small and egg shaped, hard to figure out which end is up, there is a small dent in the back that helps by feel, but visually you have to look closely to get it right. but with an all in one remote that can be fixed.
it's nice in that it will switch inputs automatically. and will power itself on and off as needed. the line in is analog or optical.
i use mine for airplay and hooked to my roku.
another advantage of airplay speakers is basic control of your music (pause/play, skip forward/back) some speakers have buttons on them, but all should have buttons on their remote.
you have remote control via the iOS remote app also. but a hard button is nice.
also once you start adding rooms, take a look at airfoil, it will let you select a single app on your computer and send audio from that. (or whole system audio also, but since mountain lion that's been built into OS X)
with both airfoil and iTunes you can stream to multiple speakers all in sync. (iOS is limited to one destination)
also with airfoil they have another program (airfoil speakers) that will act as an airplay target, so you can play something on iOS and send it to the the computer, then from there off to multiple locations.
there is a delay of about 2 seconds in airplay, so playing video can be a bit problematic. and if you do the the airfoil speakers thing i mentioned, it's 2 hops, so 4 seconds