It embarrasses me that I still only have two non-English language novels (the two that I've always had). But, these novels are where my heart is. I similarly hate that there are no women authors on my list. Maybe I should make a list of favorite novels by women, my favorite novels from non-English speaking writers, etc. Maybe I actually will.
The biggest leap, of course, is Little, Big, but at least I'm backed up by Bloom on this. He not only placed it in his Canon, but he helped Crowley to get a faculty position at Yale. I think it is a wonderful novel. It is the book that I have most given to others through the years. I think I have about four copies.
I think Powys is extremely underrated. In some ways, AGR is the most precarious choice because, in my opinion, it droops a bit in the last third or so. Still, I haven't read another novel in the past ten years that impressed me so deeply, right from the opening page.
Except, perhaps, for The Good Soldier, a book I found in many ways amazing. One of the finest unreliable narrators I've ever read. It's like watching a tightrope walker. I kept thinking, "He can't possibly pull this off. He's going to fall." But he never does.
Updike and Ellison are also new to my list. I think you all know how invested I've been for years in Updike, and Ellison surprised me with a work of astonishing depth. I think these are great novels.
All the others I have loved for decades. I'm not much of a re-reader (like you are, Joffre), but these novels I've read many times. I hope to read them all again before I'm done. Anyway, this is my list as of March 2017. It will certainly change again.