What readily available LP's should I consider

Styx, you're welcome, and glad to hear that you found a couple to order!

Rushton et al., thanks so much for the recommendations. While your suggestions will cause my wallet to grow much smaller quite quickly, the sources and specific lp suggestions are exactly what I had hoped, and are certainly appreciated.

Mrmb, you're welcome. I'd love to hear what you decide to buy first, and then hear how you like it.
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I think the latest 180g virgin 30th anniversary Pink Floyd "Dark Side of the Moon" pressing sounds great, if that's your thing. I also have an 70's era "plain jane" pressing that collects dust now. Someone mentioned the 4 LP Echoes set. I borrowed this set from a friend and thought the quality of the vinyl was fine, but I refused to buy it when I found that the version of "Echoes" was abridged--just shameful, shame shame!

I also enjoy the Classic Records 200g "Kind of Blue". Very nice quality vinyl.

Both are cliche "everyone's got em" albums, I must apologize, but I've found these to be very good quality pressings of popular choices and both are readily available as new.

If you're into Radiohead, the 10" Kid A pressing sounds wonderful...the Smash OK computer and the Bends are also very nice vinyls.

If you dig Portisehead, the Go virgins sound lovely.

All available brand spankin' new, though I did find that as the Smash Radioheads are imported to the US (not sure where you are), you need to stick with a place that deals in imports. I live a block away from an import shop so I don't know where online to get them, but they're out there, sealed, waitin' for ya.

$.02, cash tendered ;)

Rushton's choices are superb. If I might just add one more in his folk category (along with the incredible Doc Watson LPs) I would include Eva Cassidy "Songbird" 180g issue on S&P Records (S&P-501).
In the jazz category, Classic Records 180g reissue of Coleman Hawkins "Night Hawk" originally Prestige Swingville 2016