I also think Markdown is the choice of the future, but ATM, it's too limited to use in a forum. For example, what if I wanted to add a spoiler to the post, or a dice roller, or float an element, etc. Currently, there's just no easy way to add these things to markdown is there?
As far as BBC editor's go, I prefer the Sam Clarke editor: http://www.sceditor.com/
Please, no bootstrap editors.