I was looking for a speaker doc as well, but after all my searching, I only found and tested a single iPod Dock sound system that didn't suck. Seriously. Also, it was equivalent to $450 USD on sale (originally around $600-650 or so). The company's name started with the letter 'V', it was only a 3 letter word, and yet I still can't remember it.
It was very good when compared to the other speakers I heard, but not as good as the Fostex PM PM 0.5 speakers in the same room. Also, they cost the same, and you could buy an iPod dock and set it up to the speakers very very very easily.
EDIT TO ADD: Nevermind, I found it. VAF Octavio. Looks quite ace, but still, if you buy good and a separate dock, you'll get better sound and still save money.