Currently use RapidSeedbox which offers a good starting seedbox, especially when you currently start with a seedbox, additionally good upgrade plans. But at the end it depends. The most provided shows you an good overview what is currently included in their plans. Regarding the space and traffic. For more space, speed and traffic you have to pay more money SO at the end the list from avove is a good starting point. From my experience mostly it is helpfull to have more space available to ensure you can let some files on the box for seeding