Getting a new MBA from work. Moving off of IBM ThinkPad T4xx finally. Excited for a lighter laptop due to all of the travel (air and local meetings/presentations). I'm in sales and a heavy email, ppt, word, excel, onenote user. Should I go for the portability in coach with the MBA11? I was thinking the MBA13 offers greater screen realestate so I could team it with an iPad2 for the plane. Most of the time I'll use it at work with an external monitor/kb/mouse. When I'm at home I'm usually working on the coffee table. Can't decide between the two sizes or portability options. I'm thinking basic 128GB, 4GB RAM, any processor should be fine. Thanks for your suggestions.