yeah..that is better, rather I am preparing a deep level visio to understand the scenario. Though I feel there are few glitches like at geo dispersed locations, all the boxes will be behind firewall thus should be on Private LAN we can not afford to have it exposed on Internet and this creates the confusion. I think we can achieve the loadbalancing or HA at geo level by putting a GTM solutions like F5 or Radware, which automatically removes the entries of a down segment. Also, relying on Single ISP would not be a good option, in that case owning a IP address and then load balance using BGP would be an other option hence I am evaluating all the options for making a solid HA plan.
I am making a visio and share with you; then can discuss the pros/cons?