StudentFromMoscow
I decided to buy ThinkPad Yoga 12 Ultrabook with i7 and 512Gb SSD. Since Lenovo is a corporate standard in MBB consulting, hope it will be enough for MBA studies. Also excited about Digitizer Pen - should be convenient thing.
Should be a good choice.
I would recommend anything light with good battery life (you will be lugging it around quite a bit) and with books and other items it will be a heavy load.
SSD is great as it helps to reduce weight, noise, energy consumption, and potential data loss from physical abuse (though SSD's did (still do?) have a known service limit that is lower than disk-drives resulting into serious data loss, often very suddenly). Thus a backup solution that runs in the background is highly recommended. There are lots of options and many are free for the first few Gigs. Mozy has something and so does Carbonite, etc. I run mine 2x day and it is pretty quick saving docs/etc. You can also work in the Dropbox folder and that saves your changes automatically.
P.S. I do not recommend Chromebooks as you will have Excel and other applications to run on the computer so you do need an OS such as Windows or MacOS.