I need new software for the students I teach on an MA course. We have used DW up til now, bit there are licensing problems.
Tell your students to unplug their network cables whilst DW is open

NVU isn't bad for beginners; I think development is very stagnant, unfortunately.
Do you have to teach is a WYSIWYG environment? Coding in something like HTMLKit and previewing in browsers might be more beneficial.