College and laptop pickers are noted along with the CNET article about the Macbook air. As to the Apps cost issue, you could load Windows onto that or consider open source apps.
For example why folk buy Office is a mystery to me with LibreOffice out.
I am a student pursuing M.tech. I want to buy a laptop probably ultrabook. I have to travel daily to my research institute not only this I have to attend several conferences so I think I need a 13 or 14 inch laptop. I will prefer 13 although. I use some molecular docking tool for my bioinformatics work. so need a good processor (i5 will do) . Now I am stuck with lenovo ideapad yoga13, samsung series 5 NP540 and macbook air 13. please help me in selecting the best for me. I am sure about macbook will I have to invest heavily again in software and apps on macbook. Is it worth in india ? Please keep in mind I will be doing Phd after m.tech..