Philosophy is a science, at least in the European Universitarian Canon.

It's a somewhat hard topic to write about without getting too wordy, but my favorite philosophers would probably be Slavoj Žižek, Walter Benjamin, Roland Barthes and Ludwig Feuerbach.
I don't subscribe to any school of thought in every aspect (for example, the Wittgenstein-Russell-Austinian approach to semantics is in many aspects catastrophic); I rather pick favorites for the different branches (Judd, LeWitt in art, Kuhn-Popper in science, and so forth).
Among the philosophers I like the least are the Aquinate, Abu Hamid Al-Ghazzali, Martin Heidegger and Benjamin L. Whorf.