Not exactly ranked, though the first five are more fixed, the rest is more likely to be replaced if you asked me some other time...
George Eliot - Middlemarch
George Orwell - 1984
JRR Tolkien - The Lord of the Rings
A.S. Byatt - Possession
Charles Dickens - Bleak House
Jane Austen - Emma
Victor Hugo - Notre Dame de Paris (The Hunchback of Notre Dame)
Boris Pasternak - Doctor Zhivago
Anna Burns - Milkman
Michel Faber - The Crimson Petal and the White
As for non-fiction, I wouldn't get to a meaningful top ten I don't think, but definitely Massie's Peter the Great biography would be on the list, as would Tony Judt's Postwar.