| Well, it depends on how you structue your tournaments, but you wouldn't need more than four colors really.
Personally, I'd suggest a Foxwoods type blind structure. I don't like starting off with red (T5) chips, because you just have to color them up after 3 rounds. So you could do:
200 Green (T25)
200 Black (T100)
100 Purple (T500)
60 Orange (T1000)
You can do T2000 tournaments with 20 Green, 15 Black per person for up to 10 people. Or change the starting chips around to use 8 Green, 8 Black, 2 Purple for up to 25 people. Plenty of chips for color ups and rebuys.
This lets you also do T5000 tournaments with 8 green, 8 black, 4 purple and 2 orange per person (also up to 25). For less than 20 people, you still have plenty of chips for coloring up.
Good choice of chips BTW. As far as inexpensive chips go, those 9.5 gram dice chips are my favorite. | 
