You are definitely working your way through Marx quickly! I am starting to really value commentary/companion texts myself.
It turns out that I will be pursuing a Master's first, as the PhD waitlist never opened up, but that is all right. There is a decent school nearby, and I will reapply once that has been completed.
As for research topics, I am not too sure yet. I would really like to engage with Nietzsche more (especially Thus Spoke Zarathustra), and I thought about comparing his ideas with pragmatic ideas about truth and knowledge. Before I get to sure, though, there I would really like to get more aquainted with other thinkers like Deleuze, Heidegger, and Hegel.
What are you doing your PhD research/thesis on?