Are you re-visiting the science fiction of your youth, or just getting into it for the first time?
That's not meant to be a snarky question as I myself have been revisiting the sf of my youth, off and on, for the last decade or more.
I first read these in the seventies, when I was in my thirties. Does that count as "youth"?
Maybe, maybe... I'd say anything that's 30 years or more ago probably does.
I noticed that you recently read some classic Poul Anderson and James Blish (Cities In Flight) and I couldn't keep silent any longer. Back in the seventies, did you ever check out The Science Fiction Hall of Fame short story collection, or the giant Science Fiction Argosy anthology edited by Damon Knight?
I hadn't heard of either of those, but have just bought a used copy of Science Fiction Hall of Fame on Amazon. Thanks for the tip! American publications have always been far less evident here than British ones, and that goes for SF authors, too. In my "real" youth, i.e. teenage years, I read Wells, Wyndham and some Clarke, and later Ballard when he came along. I didn't read any American SF until my thirties. I didn't get on to PKD until a few years ago and have read several of his recently, as well as lots of other American writing from the "classic era", as you have noticed!