Sinfini Music recently unleashed me on a 20 Great Pianists feature. I had to choose from all alive and all dead-but-recorded, so it was kind of tough... The result is a very personal selection. So, bearing in mind that I have a bit of a thing for historical recordings, please don't take it personally if your favourites (or you yourself) are not included! Even a Top 40 wouldn't have been enough. It's online here, complete with extracts of recommended recordings.
Incidentally, the order in which the pianists appear is NOT a 1-to-20 ranking. It's done purely according to date of birth. The oldest is first and he just happens to be Rachmaninov.
I am now going into hiding.