Learned this one the HARD way.
For the dance floor area, go with pro sound equipment!!!
JBL, Peavy, etc. With LOTS of power.

I do both venues, home and bars.

The home arena offers excellant 'imaging'; the bar LOUD !!!
When you get 3 or 4 hundred people in a 'drinking' enviorment, power, combined with the speakers to handle it, wins!

If you try to use home quality compenents for this application, you'll be sorry!!!

I primarily use Crown amps for this situation, not 'high end', but affordable and bullet
proof.

You need to develope a relatonship with some one that already has these products, or find a way to get a dealership.

But, don't think you can use these products in the home. The 'hiss' will drive you crazy!
You don't notice the noise in a public area, but, you will in the home!

I play in a band with a guy that sells these products,so, I have a 5% above cost product line to offer (he doesn't do installations) and he is willing to "get his name out there" on a product only situation.