Agree with you Learsfool regarding Liszt
My favorite or greatest list, mostly based on their range of compositions for what its worth. 4-10 could be swapped around.
1 - Bach
2 - Mozart
3 - Beethoven
4 - Brahams
5 - Schubert
6 - Debussey
7 - Tchaikovsky (I can't believe it either Arh)
8 - Stravinsky
9 - Wagner
10 - Prokofiev (just me I suppose, but I love the unpredicable nature of his music, you never know where its going, very exciting to listen to, particularly his 3rd Piano Concerto)