For me, it's unquestionably W. D. Ross. Just finished reading The Right and the Good, and have Foundations of Ethics on its way to my university library. His theory of prima facie deontological ethics was a very nice breath of fresh air after drudging through consequentialist lit and being disappointed with Kantian and virtue ethics. His theory is pluralistic in terms of value and non-absolutist in terms of action - there is no one single principle or thing that grounds ethics, and there are no (or, at least, practically not any) actions that we are absolutely obligated to do/refrain from doing.

I'm also reading Emmanuel Levinas. I have a guidebook for Totality and Infinity and Existence and Existents, as well as a compilation of many of his most influential works (in excerpts). Levinas is so fucking difficult to read, though, which is why I got the guidebook to help me understand. I might get a book called Radicalizing Levinas which integrates Levinasian ethics into a broader "practical" ethics, things like animals, feminism, the environment, etc. But basically I'm digging Levinas because of his asymmetrical ethics, the fundamental non-reciprocality of the ethical, as well as his general suspicion of Heidegger's ontology as being a totalitarian culmination of the millennia-long fetishization of the Same by Western metaphysics.

So what philosopher are you enthusiastic about right now, and why should I read them.