I went with Tiny Tiny RSS. despite its name, the native interface is actually quite bloated. But fortunatley someone has written a fairly minimalist plugin UI which performs quite well on mobile devices.
I'm not sure if it's just me, or if all of the "social" features of many of the other RSS are actually useful to others. But all I really wanted is a simple thing that tracks which articles are new vs. what I've read. Pretty much every reader I came across was bloated with a lot of features and decorations that slowed it down. I belive I've got a good enough solution with Tiny Tiny RSS. It requires you to host the app on your own website, so it's not going to work for everyone, nor be exactly easy to set up.