Personally, I suggest you go back to the beginning. Start with Dragonball, which is very different than Z towards the beginning but becomes more and more focused on combat as time goes on. Later episodes are just as good as the best DBZ episodes.
Then, rewatch DBZ but the real version, not the Kai version. Kai is great that it cuts so much filler and the dialogue is a little better, but you are missing out on alot of good content by skipping out on the real version. Definitely worth watching at least once...
I suggest watching all the DB and DBZ movies in their chronological order along with the show. There are some inconsistencies with many of the timelines but you'll figure out generally where they belong. And this is where I personally would stop... But there's more...
Super and those movies in the Super timeline, I can't get into them. While they are considered cannon, I cannot pretend they are any better than GT, which is not cannon. They are all crap IMO. Not completely unwatchable, but just not satisfying at all...
But that's for you to decide, and why you should probably watch them last after watching all of the "good" stuff. I really do suggest watching both if you are going to watch any of it. I wouldn't believe the story that "GT is crap and Super is great!", you really should find out for yourself...