Periphery-to-Periphery and Wallerstein Critics

Anyone know of any good critics of Immanuel Wallerstein? I'm finding little that isn't completely ahistorical.

I probably have enough stuff right now to string together a thesis about itinerants, but what I want to bring out is their role in state formation/political integration/cultural exchange. I want to argue that there's a lot going on in periphery-to-periphery exchange that gets overshadowed by over-reliance on a core/periphery model.

So far the thesis is coming together quickly. All that preliminary work is paying off. I may be delusional, but I think I may have my first draft by the end of the month!