Hi David,
you should choose a biometric reader that is networked . Suprema and other manufacturers have IP models that communicate over the customer's network or over a private LAN. You add the fingerprint once using a reader or an enrollment station ( through their centralized management software) and it is then broadcast to the other readers. I think that most of their readers are IP with a wiegand output.
for the Protege WX, where are you located? Tri-Ed has it available for sale across the US as well as a few regional distributors.
The expansion modules are all DIN-RAIL mountable. The base controller does 2 doors as well as 8 alarm zones, has an onboard IP port and an alarm dialer. To do six doors, there is a 4-door starter kit whose DIN-RAIL enclosure supports 4 modules (so up to 8 doors). You just add a 2-door expander to the base kit and you get your 6-door support.
Yes, it does include alarm as well. It can do up to 512 alarm zones and 32 alarm partitions, with a bunch of keypads and zone expanders to choose from ( all of the expansion modules on the website are supported by the PRotege WX and its Enterprise-class big brother, Protege GX). WX is UL approved for access control, fire monitoring and burglar alarm. The UL listing information is here: ICT | Blog And also here: ICT | Blog