routing

Hopefully someone has a solution for this problem. Maybe this is
possible, but I haven't been able to trial-and-error it.

ISP0--SUBNET64.2----WAN------SUBNET26.220---ISP1
  \                                          /
   \                                        /
   MODEM0                               MODEM1
     |                                    |
      \                   (192.168.0)GW1---
       \                        /\
        \                      /  \
         NS--------------------    B

I have NS setup on network 192.168.0.0 -- then I got an opportunity to
have a second cable isp, so I figured I'd let routed on NS figure out
which is the better 0.0.0.0, i.e. better routes on the two connections.

1. maybe two defaults can't be setup??
2. maybe the configuration can be changed
3. maybe gated would be better suited for this than routed??

Any suggestions??

Rod