Yes, Androids do come with expandable storage.
But can you get a fully indexable PDF repository of 64+64GB on Android tablet with a HD or larger screen (enough for paper reading, lower res don't cut it for maths and diagrams)?
The hunt continues.
Almost broke down and bought Acer W700 with Windows8 (not RT), but the 6 hour battery life and 1kg weight finally put me to my senses. Not to mention the silly price