I'll watch original trilogy or prequel trilogy films if I feel like it on a whim. (The original Star Wars usually wins here, then maybe Episode I, since either can be watched out of context, but I do often have a grand time watching the prequel films by mocking them throughout.) Otherwise, when watching the Star Wars films in a structured fashion, I will only watch the original trilogy (4-6 the unaltered versions). The structured way of watching the movies usually only comes once a year for me.