I seriously doubt it will be Warren. She and Hillary do not have a good personal relationship, and that is one of the things Hillary is looking for in her VP choice. Two strong females working together is not a good idea anyway.
I don't know all the other choices except I've been researching Booker ever since I enjoyed watching him speak in that 15-hr marathon filibuster the other day. I like him and I like what he stands for. I'd like to see him as VP because he brings a dynamism to the position, he's real smart, and Hillary enjoyed campaigning with him, which is a good sign.
Gotta admit, though, I need more education on all the other possible choices.