Sowell is one of the best intellectuals in American conservatism right now, but that's also clearly where he makes his home, which is disappointing from a LW perspective. The two books by him that I like best are Knowledge and Decisions and A Conflict of Visions. The first is, if I remember correctly, an updated explanation of Hayek's insights, although the second ~60% of the book is spent on 'historical trends' and is probably about as biased as you would expect. The second is explicitly about politics, but its first chapter is tremendously insightful. (The latter sections of that book are basically more detailed repetition, and again I would expect the examples to be solidly conservative-leaning.)

You've definitively solved the issue of the political orientation of Nazism by merely noting the word "Socialism" in its title, just like a stereotypical American conservative does, without even the need to know anything about Otto and Gregor Strasser or how the left wing faction of the Nazi party was defeated, expunged and purged.