Octiv Stage 450 dock is one of the smallest iPad docks out there. Its manufacture claims that their dock sports amazing sound quality and can also rotate, thus allowing the user to change the iPad orientation from landscape to portrait.
This head of Octiv Stage dock can also move back and forth so that you set a viewing angle that suit you. Aux input is also present through its mini jack connection.
On the downside, the speaker on the back is muffled when iPad is used in portrait mode. It is bit on the expensive side too – costing 130 dollars.