I'm finishing up my MA at UT-Austin now, focusing on 20th century China as well and would recommend looking into our program. Like most public universities we only have one modern China historian, Huaiyin Li, but he is excellent. Working with him has definitely had a tremendously positive influence on how I understand China, history, and research. I know from experience that he won't let you focus solely on intellectual history, but will make you tie your project into institutional, urban rural, whatever history as well, which in my opinion is a very good thing. He does however have a recent book on the evolution of CCP historiography to go with his detailed microhistories and a forthcoming book on late Qing statecraft. Generally speaking, he's a very well rounded and well respected intellectual in China and the US. China faculty in other areas (government, IR, and so-an) are pretty much nonexistent, which is the major downside to the program, but the rest of the Asia faculty are very global-oriented and very accessible. Plus, the history program in general is pretty highly regarded. Plus Austin is a pretty excellent place to live.
Worth checking out in any case. Good luck with your apps!