I've tried all manner of so-called high-end speaker docks, and they all seem to have either good functionality and poor sound, or vice-versa. I heard about SoundFreaq from a friend in the States, where apparently it's causing quite a stir, so I decided to give it a try. Sound is excellent, well up there with big names like Bose and so on. The Bluetooth pairing is effortless with both phones I've tried it with, although I'd say the sound is a tiny bit better when using the direct iPhone/iPod dock (I guess that's a limitation of the Bluetooth system in general though). To cap it all off, there's an excellent companion app available from iTunes which has a huge amount of functionality, and apparently works with all iPod Touches, iPhones and iPads.
Highly recommended.