Billion routers in mixed NAT/routed configuration

I am in the process of replacing an ADSL router that has suffered a hardware failure and one of the possible candidates is a Billion - probably one of the 7800 series models. My current LAN is a manually configured IPv4 /29 routed subnet with additional hosts using private address space via NAT and DHCP.

In the past I have encountered routers that support either NAT or routed IP but not both. Can anyone with experience of Billion routers confirm if they would be suitable?