Well, I have my boxes at the minimum, 400, in D III with 50 boxes. That still does not sell them out. My courtside are at 72, but anything between 70 and 75 should be ok. The other two matter more about performance. If you think you are going to do well, you might be able to bump your bleachers up to 12. If not, 8-10 should be fine. My lower tier are at 3000 and priced at 22, and that works well. I would imagine that you would want yours about where they are: sub $20.
Hope this helps,
TicTacShack