I’m not sure about the version of Markdown, but here’s some plugins
I use markdown-for-wordpress-and-bbpress to get wordpress to render posts and comments in markdown format.
For editors, I prefer markdown-quicktags. It has a bunch of auto-complete features, and seems to be the most actively updated markdown editor plugin. You might also try wmd-admin for the wmd editor (Same markdown editor as the stackexchange) or wp-markitup (not markdown specific)
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