After wrestling with the new netgear modem/business gateway for the better part of 10 days, I’m finally 100% back online.
I can confirm that the Netgear cg3000dcr does indeed work with an ASA 5505 running 9.1(2) AND I’m able to assign all 5 of my static IP addresses with the ASA doing all the NAT. You’ve just got to get someone at Comcast to properly put the modem in bridge mode. It’s more than one step / check box on their end. You cannot do it. They have to, because the cusadmin account doesn’t have the requisite web GUI parts available.