Suggestion for "Convert line breaks into HTML" and text editor for corporate website
You can use Wysiwyg (or CKEditor) along with most editors and use Wysiwyg Linebreaks to make the editor work great with existing content, or when switching between editors, and in other circumstances.

Also, Wysiwyg should be pretty stable (I've been using it on a ton of different sites), especially when using it with CKEditor, TinyMCE, or most other editors.

For most of my sites, I have the Convert line breaks into HTML option checked no matter what, mostly because I like being able to see/edit content without extraneous paragraph and line break tags all over the place, and so paragraphs don't get run together.