where can i get good speakers

for our practice and live shows because we got a mixer and like how can we all sound at the right levels. i think it is that we need speakers now. anyone know where i can get loud ones. and i wanted to know if a berigner 412 cab would work for sound.

So, you're saying you have a mixer, but no speakers to go along with it? Is that mixer powered or will you need power amps too?

Behringer cabinets are designed to be used with a guitar, so you do not want to use those as P.A. speakers at all.
You problaby might want to check out either Carvin or Peavey, they have reasonably priced P.A. gear.