Are you renting gear for that, or do you have the inventory to support that many people?
I'm renting. My entire rig makes a good drum monitor at that level.
If I can get approval from the board I will be renting 6 EAW KF850 tops and 8 EAW SB850 dual 18 subs all with MacroTech amps. That won't cover the entire area but it's within budget and will cover the immediate area very nicely.