Let's start here. Most of you are pretty advanced readers, so this list from Buzzfeed is a good place to get some great recommendations, modern classics as well as recently released books.
I'm going to go out and say, while I've not yet read the book, the Ta-Nehisi Coates book has got to be outstanding. I've read a number of his pieces in The Atlantic (see this one for example) and he's just so good. I mean, if you like non-fiction where the voice is strong, perceptive, backed up by evidence...you know, just solid essay writing. Start with Coates. Please.
