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Well the whole point of a powerhead is to give more flow to the corals and clean the sand of debris, but if you have no coral or sand because its a QT, then i dont really see why you would need a powerhead.. Good question.
And for the filter i would go aquaclear 50 or 70. I reallyy like the 70, i like it way more then my 50. There isnt much of a price differance between the teo so its up to you
A power head could be used just to get the unbeaten food and waste off of the bottom of the tank and into the filter. You don't need one, but I guess it would help