Russ, if you're going to supply an 808S and two C300 speakers, that's a fantastic system - mine. My limited experience with house sytems is that they are usually not as good as your own. This might be different. BUT, I would think most pros have their own stuff and are quite used to lugging around.

You might be adding to stage clutter if the acts don't use the system. Others may not see the system as easy to use as you do. My suggestion would be to hold off on a house system until you've booked a few acts and get their feelings on the topic.