For professional reasons (which fortunately dovetail with my personal interests), I have to read a lot of literature on international relations, globalization economics, international law, and political theory. This quickly leads to political philosophy and philosophy in general, where I'm acquainted with the field as a devoted amateur; and also to history, where I'm trying to fill in my gaps.
As regards personal preferences, I'm not sure this will speak to anyone, but in IR I'm a firm constructivist (Wendt) with a heterodox realist and International Political Economy lens (Strange) informed by historical institutionalism (Zürn). In economics, I suppose I would gravitate towards world-systems theory-oriented (Wallerstein, Arrighi) and moderately globalization-critical authors (Rodrik, Tooze). In international law I'm interested in the new school critical of the distributional outcomes of encoding economic rules at the international level (Pistor), and very attentive to the challenge of defenders of maximum national sovereignty (Schmitt).
Generally in philosophy I gravitate towards questions of justice and authority, as they flow into political theory. I read quite a few of the classics of political philosophy a while ago (Plato, Aristotle, Confucianists, Stoics, Machiavelli, La Boétie, Hobbes, Locke, Rousseau, Hegel, Marx...) as well as the moderns (Arendt, Berlin, Strauss, Kojève, Habermas, Foucault, Rawls, Lyotard...), but I have gaps (always). Schmitt I suppose is my "dark star" in political theory broadly speaking, as the "conservative revolutionary" whose dangerous ideas are reemerging faster and faster. I try to counterbalance him with anarchist (Malatesta) and ecosocialist (Gorz) theory. Then personally I've been moved to read more feminist (Beauvoir, Cuboniks), queer (Butler, Wittig), and demon-quote "critical race theory" (Fanon, Coates) — even, horrors, as a three-in-one package (Lorde) !
I think Alexievitch's nomination for non-fiction writing was an outstanding choice, and I'd love to read more like that. I've enjoyed some of Naipaul's travel writing (once one gets over the author's sometimes evident disdain for "the natives"); I've heard Kapuscinski is good, and he's on my shelf. So are Coetzee's literary essays, and Sebald's. I'm very curious to read some of my favorite authors' opinions on literature — and I like it when they have "strong opinions" like Nabokov, that shake up the canon a little.