Help A Girl Out: Which Series?

So, I’m having a dilemma, friends. Maybe you’ve heard me mention my Pile of Shame before on the blog, which is basically a list of all the incredible books I still haven’t read yet that I fully intend to conquer this year. This is *kind* of about that, except I need your help filling in some of my worst series gaps. I’ve narrowed it down, but now I can’t decide which one to start first!! To be clear, there’s quite a few series that have only one book out and I’ve left those out because I figure I’m not so behind on those. No, these few series are a couple of books in or even entirely OVER. *Sigh*

Thanks for your help, guys!!