Juscuziam

I am doing a home installation and have a couple of cable questions. I have a speco DVR 960h with 2 Ever focus EHD700 720 dome cameras (adding more later) so it comes down to cabling, do I run coax or cat 5? what will give me better video quality? I will also be using Video Balun with Power Connector is it possible that they will degrade video performance once the signal hits the balun and converts it through into coax feed does it impede video performance ?