You pretty much nailed all of them, my personal favorite would be Klonoa (one of my favorite games of all time), Heart of Darkness also is very dear to me being one of my very first PS1 games, I was totally blown away by it's graphics for the time. Skullmonkeys is also very unique in terms of it's humor and graphics (best bonus stage in a game ever!) and of course how can we forget SOTN and it's killer soundtrack, giant sprites, and classic voice acting. If you don't mind Im gonna give your article some exposure on Platformer Update.