I use an older version of this Karaoke mixer as the heart of my home system, and hosting for our private Karaoke club and have never had a problem with it.
http://www.audio2000s.com/products/m...ps/akj7000.htm
Read the features. You're gonna want every one of them before it's over.
Last year got tired of stepping over mike cords and went to two four channel wireless systems, and still have room to add more with the built in mike inputs if we grow.