Along similar lines, but a bit cheaper, are these
I find them acceptable for music, but admit I'm no audiophile. You'll also need to figure out some support for the ipad unless you're happy to lay it next to it.
Airplay is the way to go though, if you can justify the price.
Do you have a TV with surround sound or other decent speaker set-up? You could use an Apple TV to play through that via airplay if so.