It depends on your taste (romantic, fiction, adventurous, so on) but I think you can try such famous books as Gone with the wind, The old man and the sea, The great Gatsby, Adventures of Huckleberry Finn, To kill the mockingbird,.. I have read those books and they're really worth reading (at least once) ;)

Then reccomend me some modern writers please.

Classic works may serve as nothing in language improvement, theoretically nobody speaks that language, eg reading Shakespeare or John Donne, except for a very advanced learner, it's a great waste of time. Read good books, more modern books.