I guess for me it would be the blue testers ears. But it would not be fair for me to have them since I already have the thing I wanted most.. my chicken hat! And since I won't take it off, the blue ears would be a waste for me.
I would like the flying carpet. The coolest of the cool, I have heard it really flys around the room. But alas I have never seen it. I'm excited just to see it operate even if I don't get it.