Hope you can help me with my purchasing dilemma. I will be on the road working on a project for about 6 weeks. I need a new laptop and it will be my only pc for the duration of the trip. I am torn between a MBA 13" and a MBP 15". The MBP will be better for the 6 weeks, but after that the MBA will be better for my shorter trips. Any thoughts on which choice might be better? Can I really use the MBA as my only pc for six weeks considering it will have to be used all day for business purposes and for entertainment purposes in the evening?