I like Jethro Tull, a lot. Yes too, King Crimson, ELP, XTC, Gentle Giant, Genesis, ...but they mostly need new life in their quality recordings. It's a tough proposition, both from analog and digital.
NIN I like too.
I like Jethro Tull a lot too. I call JT Renaissance Faire rock (I know they are considered progressive rock, I just sometimes make up my own categories, I can do that, I have the chops).

I actually prefer JT's acoustic stuff, but I like it all. I have the JT Remaster CDs of most of the albums, but for some reason, but the vinyl versions sound much better to me.
One of my favorite Yes songs is Starship Trooper. I don't like the Yes SACDs, they sound lifeless to me, like there is no dynamics. The regular Remastered CDs are alright though, but again, the vinyl brings it all out for me with Yes. Especially that Yes Album, gods! That's a good one!
King Crimson, ELP, XTC, Gentle Giant, NIN and Genesis just don't resonate for me regardless of format.
My Prog Rock bands of choice are: Rush (numero uno in my book), Yes, Jethro Tull, The Moody Blues, Renaissance, Lighthouse and now Porcupine Tree (although I'm not too sure I'd call Porcupine Prog Rock..they are kind of a different burrito, but still fit the Prog category). Pink Floyd, Kansas and Boston are ok.
Not done discovering though, I might run across another sometime.