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!