I was planning on buying a 15" MacBook Pro with dedicated graphics. I felt the extra power of the quad-core and dedicated graphics would be useful as I do a lot of photo editing and video editing. All my editing is currently done on a desktop with two monitors. Now I am thinking that the MBA might be the better choice for portability as I can still use the desktop when I'm at home. Has anyone here done any editing with LightRoom 3 and Nik Software Viveza 2 and Silver Effects Pro on an 2011 MBA? Does the 11" have enough screen real-estate to do editing or will the 13" be that much better? Also, is it possible to connect my two external monitors to the air or just one with the built in screen? I am curious in case I decide to replace my desktop with it.