PPRuNe Towers: Sorry, I dont know what AAC is
I do know exactly what you mean though, about holidng the two at the same time. My local shop has a display iPOd and it is pint sized compared to the others. I have no doubt that iPod is better. But its not $250 dollars better than the Zen. The Zen is bigger but its not exactly brick like, quite portable I would have thought.