After thinking about the Airport Express option more, I'd avoid it. iTunes won't be able to provide multiple streams to different AE targets.
So I like the Duet with Duet controller.
If you have a large house and you're worried about coverage, get an Airport Extreme base station and a couple of Airport Express units configured as WDS repeaters and you'll have good 802.11 coverage everywhere.
So I like the Duet with Duet controller.
If you have a large house and you're worried about coverage, get an Airport Extreme base station and a couple of Airport Express units configured as WDS repeaters and you'll have good 802.11 coverage everywhere.