Truthfully, it'd be Dan. Clark already knew he wanted to be with Lois, but she just couldn't make up her mind! Not to mention, those gifts...

"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited