Well, I knew I was letting myself in for it when I posted a list. The number of visits to this blog blipped up, and, everyone has a candidate for addition or substitution. Recall the point of the list. It is not a list of my favorite philosophers, or a list of the people anywhere in the world who have, in my judgment, made important contributions that I consider philosophical. It is a short list of books [not people] that a graduate student pursuing a professional career as a Professor of Philosophy in America should read before he or she gets the doctorate and goes out to start teaching. And it is not all the books he or she should read, of course. Note that it stops in the earlier nineteenth century. After that, philosophy goes in a number of different directions and there is no longer a single tradition one can identify. I also simply assume that any graduate student will, in courses, become familiar with whatever contemporary texts his or her professors especially value.
The real point of the list was as part of a warning that no matter what hot questions and modes of philosophical discourse are "in" right now, you can be sure that in twenty or thirty years [i.e., when the young grad student is still teaching and writing], they no longer will be. So just reading the journals will prepare you rather badly for a lifetime of ptofessional philosophy.
Now, you may respond that to do serious philosophy well requires reading widely in fields other than philosophy, but if you said that, you would be guilty of teaching your grandmother to suck eggs, as the most casual perusal of this blog or my published works would make clear.
So, go read the twenty-six books on the list, and then we can have a fruitful discussion about what you should read next.