I have had experience with the JBL Creatures (obviously) as well as Logitech. They both sound very good.
Unfortunately, I don't have personal experience with Cambridge Soundworks, but thumb certainly gives those speakers a high rating.
You would probably be best-served if you see/hear the speakers yourself.
I don't know what stores you have locally, but quickly looking at websites, it seems that Best Buy carries the Logitech speakers & I have seen the JBL Creatures previously at the Apple store.
Good luck!