For Atom/RSS canto should cover your needs, provided you are looking for a terminal based reader. It runs as a daemon with a ncurses interface.
http://codezen.org/canto-ng/
Newsbeuter should be interesting, but I've never used it.
But it uses more RAM than my window manager, (GTK-based) text editor, taskbar, or shell, just to load the stock 3 feeds. And then canto-curses takes half a second to open (on hot cache, so it isn't waiting on mass to scoot anywhere, but it makes about 3000 syscalls interrogating the disk for all its dependency libraries), waits for a full second to do nothing while closing ("select(0, NULL, NULL, NULL, {1, 0}) = 0 (Timeout) <1.001081>" in strace), and uses even more RAM than the daemon--with an entire additional python interpreter.
Thanks for the recommendation, though. I'll let you know if I find what I'm looking for.