Well, there's certainly nothing wrong with the Bose SoundDock II according to the WHF review.
Without a budget in mind, it's difficult to advise really. I wouldn't be too worried about the power rating of these various docks - just because something has an ability to go very loud, it doesn't mean you have to! At the end of the day, your best bet will be to go somewhere where you can have a listen to a few at various different prices, then make a decision on what you hear.