A healthy Clijsters is definitely back in the top 5. She's basically a baby Serena. Hits a bit softer, arguably moves ALMOST as fast, still... she's gotten very far without a killer instinct. She's physically in the same elite group as Sharapova, Serena, Lindsay, and Justine (?). Everybody else are a notch below, girls like Mauresmo (I know I know), Venus, Kuznetsova, and Myskina.
But who knows? Maybe she's one of those well-rounded people who can be happy outside of tennis and realize during an injury hiatus that she didn't love competition that much.