I currently only buy Captain Marvel. I had a mild interest in Elektra and Black Widow but not enough to add them to my pull list. I've ended up reading them box through code trades and they are very good. I hope they both get the oversized treatment because the art on both is phenomenal.
With the future of the Invaders uncertain and AU already confirmed to be ending I'll probably be looking to add to my pull. Maybe Storm? I dunno, never found her interesting.