So, we have...
Mods: Great balls
Smods: Ultra balls
Donators: Luxury/Safari Balls

As for the numbers, I think 8 for all staff members is enough, especially given the size of these balls. For donators, they should have a lot, but they're not staff, so I say give them 7.

Edit: By donators, I mean those with the green names. If they're staff, that overrides their donator status.