There is no way I'm spending another $150 on a mic right after a $1300 empeg and a $600 - $1000
installation.

Why is your installation so very expensive? Does this price include amps ans speakers?
I'm pretty sure the install of the empeg should not take more than 2 or 3 hours including all wiring. If you pay about $70 per hour for an installer (who should do the work in less than 2 or 3 hours) it should not be that much! If this price includes amps then I can understand.

TeeMcBee