How many season sets will there be of Dragon Ball Z

there will be nine...

1. Vegeta Saga
2. Namek & Captain Ginyu Sagas
3. Frieza Saga
4. Garlic Jr., Trunks, & Android Sagas
5. Imperfect & Perfect Cell Sagas
6. Cell Games Saga
7. Great Saiyaman & World Tournament Sagas
8. Babidi & Majin Buu Sagas
9. Majin Buu Saga (continued)

After that, there are two seasons of DragonBall GT

If you're after the WHOLE story, check out the original DragonBall series...

Pyro