re: Levinas, I think he fails a bit in his own mandate when it comes to how he conceptualizes women/sex difference, & elsewhere. But personally have found a lot of worthwhile stuff in his writing on difference/alterity and also time? Probably the first place I encountered non-teleological philosophy ("the future is genuinely new, it does not spring fully formed from the bones of the past" is also something I liked a lot). Also Judith Butler's Precarious Life draws heavily on Levinas & is also quite good, imo.