Commonwealth saga by Peter F Hamilton (or you can start with a smaller prelude novel, Misspent Youth): heavy sci-fi that explores several concepts: rejuvenation, internet that connects brains, and many others. It shows how those technologies affect society and human relations.
The Kingdom of Infinite Space – very philosophical journey inside your head and how you mind works.
Finn Fancy Necromancy – light reading. Imagine Harry Potter written by a comedian that loved the 80ies.