My Arduino Yún is just arrived. I'm seeking around the 5V wall power adapter for it. Luckily, I found three wall power adapters at home and I hope I do not have to order the other one on line.
Option 1: Apple iPad 12W USB power adapter. 5.2V 2.4A
Option 2: Apple iPhone 5W USB power adapter. 5V 1A
Option 3: Unknown brand 5.0V+-5% 0.15~0.7A
The best choice is probably option 2. Can I try option 1 or option 3?
I haven't gotten my Yun yet (though shipped just from "across town", it hasn't arrived by yesterday, as projected by the tracking info and tomorrow is a federal holiday, so the postal service is down for a day), but I would myself go with something like your No.2 choice as well. The iPad charger with 2.4A is a bit overkill, though the No.3 option might be a bit questionable, specially if you intend to add some power drawing shields to your Yun. Otherwise, it should work just fine as well....