Is the new air 2.0 powerful enough to run an external projector On my macbook when I run keynote the external projector displays the slide and the lap top displays the next slide and the previous slide and notes. i noticed on the specs for the new air that it supports "mirroring and extended desktop" where the macbook pro supports "Mirroring and dual monitors" what is the difference? Also I run a lot of quicktime movies in my keynote presentations. do you think the new mac air will be powerful enough in these types of settings? I would really like to leave the heavier mbp home if i could?