I am looking to purchase the "Behringer EUROPOWER PMP5000 Powered Mixer"

I need help to know how many speakers, and what size would be the best for this mixer. I am thinking 2 BR15 Yamaha speakers or some JBLs or something. I just dont know what size (10s,12s,or 15s) and how many would be the best setup.

The mixer has this power rating:
Peak Power, both channels driven: 300 watts @ 8 Ohms per channel

Any advice?

Or if you know of a good PA system setup for around $1,000 please let me know your thoughts!