Best markup for short stories on wiki-like site

For a site where users can edit anything, what's the best markup to use for writing short stories? markitup is a good candidate editor for this and supports the following markups:

• Html
• BBcode
• Textile
• Markdown
• Wiki syntax
• Dotclear

This seems like a good list of the popular markups out there. Which to choose? Here are my thoughts:

• Html is the front-runner due to its ubiquitousness and, therefore, longevity.
• Markdown is a popular and attractive alternative to Html for simpler rich text writing like my needs.. maybe attractive because I'm used to it with SO?
• WYSIWYG editors like ckeditor often only work with Html.
• Because of the wiki nature, I want to show nice diff's. I imagine Markdown code looks a lot nicer diff'd than Html code. Alternatively, there are more likely existing libraries I could take advantage of to开发者_如何学C diff rendered Html.
• Links to pages within the site are special. Images should have their current description upon hovering and current caption, profiles should have as link text the current name, etc.
• I love that Markdown has limited functionality which is pretty much what a short story needs.

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I'm publishing short stories on a Dotclear blog. Speaking of experience, I think that Dotclear markup is great but not adapted for one huge reason: it ignores "enter", you have to write "%%%" to force a new line, which is especially painful in dialog.

When writing, you want to think on the writing itself, not the markup. Most of stories don't use any markup at all. A few italic from time to time, a title, that's all.

My advice would be: take an existing story, convert it to the markup and take the one with less stuffs in the body of the text.