Hi I' m waiting for my first Mac Pro until now I had only iMac. I've 2 little question for you: 1) I want to put my Mac Pro on my desk and not under the desk. It may be too noisy in comparison with iMac 27"? 2) with my iMac I've a really good built in mic that allow me too moving around the room with no problem. With Mac Pro i need to buy an external mic? any suggestion? thanks!!