I realize this is sacrilegious, but I'd love to see a version of the movie with completely re-done effects using modern CGI. Using Daren Dochterman's amazing Enterprise model with its perfect pearlescent paint job, of course.
As much as I appreciate the amazing model work in TMP, the film quality varies significantly from scene to scene, and I long for a consistent, in-focus look. Plus, the other models don't hold up nearly as well as the Enterprise. The orbital office complex near the Enterprise dry dock and station Epsilon 9 suffer from looking very much like models.
As more talented people get access to amazing rendering tools, I'm hopeful some enterprising fan will take on the task.