Putin, I'm wondering, have you moved to texts that actually expand Marxism in a meaningful way? Positive scientific works from economists like Kalecki, Kaldor, Pasinetti, Sraffa or Roemer? Or do you preffer normative works that focus on social critique from moral perspective, something that a positive economist like Marx would despise?
Also it's interesting that obiwan likes Plato and Nietzsche, philosophers I have a very reserved relation to, together with Hegel and Sartre. I'm definitely biased since I haven't read much from them (in case of Hegel even nothing) but I find it natural that I don't wish to spend too much time studying works from guys that didn't click with me at first.
I blame Plato for being an intellectual hypocrite, guess who would be the first one to try free fall from that cliff in Sparta), although one can't deny the tremendous inspiration he provided for generations of philosophers, which kept them occupied until they moved on to more sensible teachings of Aristotle (to those who disagree, ask yourself whose kind of realism is more sensible, disregard the fact that nominalism trumps them both). Also, the notion of World of Idea is pretty damn funny, especially when its most articulate modern proponents are probably obiwan's beloved mathematicians.
The problem I have with Nietzsche is his position as an icon of intellectual poseurs (Sartre, be patient, I'll come to you in a minute), which partly stems from a fact that his works resembled Plato in their verbose and literate inclinations (providing space for meaningless disputes about what he actually wanted to say, the often quoted God is dead being a prime example) and partly also from his nihilism (hipsters like that). Other than that, some of his ideas are interesting but one should stay away from the later works that were written with the "help" of his sister...
Criticizing Hegel is probably redundant, his dialectics and idealism do that for me all the time. His grand theory was probably the most detrimental philosophical construct the mankind ever encountered. Minus points also for the fact that poor Schopenhauer had empty aulas because of those parallel lectures given by Hegel.
Where Camus provided existentialism with some value (although it was still basically a rip-off of that giant of 20th philosophy Heidegger), Sartre stripped the thoughts to the bone, added some sugar coating and sold it to ecstatic masses of hipsters. Still, he may be redeemed by his role of public intellectual.
Since I seldom agree with some philosopher on everything he proposes, I don't really have a favourite work to mention, although guys like Nicolas de Cusa, Popper, Baudrillard, Heidegger, Jonas or von Hayek come to mind first. Then there are interesting ancient guys I know very little about (and that knowledge is second-hand, not from direct reading) but who I wish to read sometime like Gorgias, Herakleitos, Mozi and Han Fei.
When it comes to fiction, I adore Vonnegut, Coelho and Mahabharata. I also have a strange affinity to spin-offs to legendary series, I like the works by Brian Herbert and K.J. Anderson more than original Dune and also Second Foundation trilogy more than the original one. Not to mention that Hobbit and Silmarillion top Lord of the Rings in my eyes, although the films are damn nice. A comic is fine too.
"these days I only read non-fiction" doesn't sound that douchey to me, I remember a time when I was 16, reading some pseudohistorical novel from Persia and then suddenly realized how many times I already read something similar in archetype to that book and was simply disgusted and puzzled. Semi-permanent halt in reading fiction ensued and it took some time to find out that reading shit just for the sake of reading is just as bad as not reading because of fear of reading shit. Nowadays, I still read mostly non-fiction because I don't have much time and also because the real world is so fascinating that few made up stories can rival the joy from finding out something more about the stuff that is going on around us. Not to mention that deeper knowledge of e.g. social sciences is probably more useful than reading everything from Shakespeare although it's obiwan's field of study so it would be stupid to criticize my fellow same-age-as-myself student for that.
Sorry for that wall of text, but few incetives to be tl;dr are stronger than procrastination of unpleasant tasks (as practising Lagrangians in my case).