Well another sort or accomplishment under my belt, I have successfully added a third nice to Server. Set it up for bridging, after trial and error, a lot of aggravations, and finally bucking and asking for help.
I now have a working topology as such:
Nic 1 — LAN 1 — Host only < for the underlying host, media server and storage system. Nic 2 -- LAN 1 -- br0 KVM set one, original servers including this web server. Nic 3 -- LAN 2 -- br1 KVM set two, new servers on separate wan connection. All working so far after a few hiccups. Love this stuff! EOL