Which Macbook / iMac / Mac Pro should I go for in my general use of - a few tabs of excel, a few tabs of word, a few tabs of Adobe PDF, some tabs of web browser, Microsoft office 365 Outlook with .pst files amounting to about 400 gb. A good configuration is what I am looking for. Presently using Lenovo Thinkpad W530 with 32 GB RAM, Intel Core - i7-3940 XM CPU @3.00 GHz - 3.20 GHz. Can I manage with a new MacBook air 13 inch maxed out as my primary system and connect two 27 inch external displays? I intend to get rid of this thinkpad and switch over to Apple.