One of the best is columnist Charles Krauthammer. When Rush Limbaugh said Krauthammer was one of the smartist men in the country, I had to agree with him. The old Commentary magazine was outstanding, although it required an IQ of 145 minimum to read it. The mag was divided into a general and a second Jewish culture section. I have no interest in Jewish culture. The general section was the part I read. It was one of Reagan's favorires. Midge Dector was writing tough conservative books before others had the guts and brains to do it. Her Liberal Parents, Radical Children was written at a time when saying such things would get somebody crucified. Commentary's Susan Garment was brilliant, although I don't know whether she has written any books. Reagan's War gave insights into Reagan when he was a young man. It was worth the read. Olson's The Final Days left me flat. I bought it to support the cause, but it lacks substance and ideas that would last over time. For those who wanted to cheer hatred of Hillary, it was a hoot. However, it was somewhat predictable and repetitious. My disgust with either of the Clintons is widely known. Norman Podhoret's analysis of Viet Nam was a little to hastily written, but a groundbreaking effort.
Some of the best conservative books are written by extreme leftists. Robert McNamara's In Retrospect establish him as a leftist blowhard subversive more who sabotaged the Viet Nam war more authoritatively than any conservative writer could have done.
And don't forget Tom Sowell. His Ethnic America was brillian and well documented. There's a lot of meat in his writing.