VivienM is correct, the CGN3 is the ONLY option.
The wired on the CGN3, is just FINE.
Well.. mostly.
Will all depend on the device. There is a problem with SOME 10/100 devices, not linking properly on the CGN3. Anything gigabit should be just fine.
I currenly have a 5 port gig switch into it, an 8 port gig switch, and a gigabit wan ASUS router, without issues.