Very basic question here. Is the MBA audio jack output only? Reading the tech specs, I believe this is the case, but wanted to confirm. I'm debating whether I really need to get a USB headset for Skype or if my iPhone headset will do. I am guessing the former.... If this is the case, what have your experiences been using a USB headset with your MBA? The BT headset experiences sound like a USB headset would be the only practical solution. Thanks guys.