retrouvailles: I agree that I was focusing more on avant garde than perhaps "mainstream". But, let me add this. As far as researching, I've been doing that off and on, desperate to find modern music that I would truly love to play. (You know how much Bortkiewicz I'm doing, so when I get excited by a composer, I'm more gung-ho than anyone!) Anyway, I spent a significant amount of time looking up American composers in particular, as we all like to play the music of our countrymen if possible. In particular, I narrowed my search to Neo-Romantics (that fits me, right?), of which there were many (here in the U.S., we have four composers on every street corner), which raised my hopes for finding something lush and melodic. But as I read the repertoire descriptions in Hinson's guide, which were quite specific concerning the nature of the pieces and composing techniques employed, I found most were total turn-offs. Most of these "Neo-Romantics" are using 12-tone rows, atonality, polytonality, huge doses of dissonance, etc.
Nevertheless, I slogged through and after all the sifting and re-sifting came up with Danielpour, Del Tredici, and Corigliano as seemingly promising leads. Next, I went onto Amazon to see if there were any CDs with piano music of these composers. I found Corigliano's "Adagio" from the "Gazebo Dances", so listened to the sample. The title is promising, yes? It was GOD AWFUL! DREADFUL! This so-called "neo-romantic" writes atonally, and the adagio was a stuttering staccato! He's got to be kidding. I'm still looking to hear Del Tredici's "Fantasie Pieces" and "Soliloquy". Maybe they'll capture my interest, maybe not. I hate to just buy the sheet music and find that it's a bomb. Same with CDs.
So, I'm not just damning mid-20th Century music out of hand. I have, in fact, been looking into it. Maybe not as intensively and enthusiastically as I should be, but trying to be dutiful about it. As I said in my original post, these composers are a vast legion. And being in the moment without that historical perspective on quality, it's like looking for needles in haystacks. It might be that the American neo-romantics are not the best, and perhaps I should be shifting my focus to Europe. Any suggestions?
indutrial on historical perspective: Very well put!

Regarding Carl Vine: I did listen to Vine's "Sonata". (Someone in the forum posted it a few months ago.) The playing was very good, but I found the piece very dry and academic. I've since read that Vine specifies that "Romantic interpretation of melodies, phrases and gestures should be avoided whenever possible." That is exactly the kind of composition that I would avoid at all costs! It would rub against my grain. It's late-20th Century music without heart. What a turn-off! What are better examples of his output that I should be hearing?
Some of you will think I'm hopeless when it comes to modern music, and I certainly understand your reaction. But in fairness, I do make some efforts to connect with it, although I usually come away disappointed and feeling frustrated. Here's the challenge: In the 21st Century, I'm The Last Romantic. So where to turn to find music that The Last Romantic would take joy in playing? While you mull on that, I'll zone out to Philip Glass' endless and repetitious ostinatos that are considered so intriguing and revolutionary in the new music. Skxxxzzzzzz, snorrrrre.