We have chosen to use the JCE WYSIWYG editor for Joomla!™ with the Advanced Image Manger, File Manager and the additional plugins available as needed. The default editor for Joomla! doesn't offer the additional features that JCE offers.
Now creating internal links and adding pop-up images are all done easily without having to learn html.
Have a peek at the JCE knowledge base tutorials to get a better idea of how easy JCE is to use.