Arduino + Android (Amarino) + [BLANK] = Wireless control.

So as the equation subject really.

What bluetooth board would work with that setup?

I'm not worrying about what can be sent/received with amarino etc at the moment but I want to get a bluetooth module so I can start messing :D

Which of these two would be best, if any? - Also would it need to be a master/slave? I presume slave..

Or (which is half price of the other):

Details on Amarino: