I'd be reaaaaaaal careful about FP while you're at it. It's a lobbyist organization, no matter how much it pretends it isn't - kind of a right-wing counterbalance to the Union of Concerned Scientists. It's useful right now for somebody to start the narrative of "what we did to Iran really wasn't that big of a deal" so that there's good'n'proper pushback on any deal with Iran. As far as books, the first two are probably the broadest and a great place to start. Legacy of Ashes was a hell of a read, albeit kind of a bittersweet one post-Snowden; Wiener paints the CIA as this crippled, gelded organization with no real power when in fact their budget tripled after 9/11. Shit, they gained a goddamn air force.
Sure, sure, but I really enjoy some of the essays that get published. I can't help it. It's high quality as hell and right of center as hell, but at least they're writing about history and trying to put events in a historical context, even if it has bias. I might just give up on periodicals, except maybe NY Review, because I'm so tired of the narrow scope.