I have ordered 1 GB internet service (BW) hand off from Bell. The firewall will be the gateway for 5 offices with total 200 users. I would like to install CISCO ASA 5500 series as internet gateway. ASA will have VPN to AZZURE as well for AD and SQL sync. Can you suggest the ASA model best fit for us? Current firewall is 5508 X which handles 1 office (40 users) and 200 GB hand off but we are upgrading the circuit to 1 GB and adding 4 more offices (total of 200 users).