[TriLUG] source routing question

[Chris Bullock]

Scenerio:
2 internet firewalls (DSL, Cable)+ 1 internal router (router)

All internet traffic currently goes out Cable, I want 1 specific host
to go out the DSL connection.  Everything I have seen involves
creating a table and I really do not want to do that.  Ideally what I
think it should look like is this on the internal router:
/sbin/ip route add default $DSL from $host
or
ip route add default via #DSL src $host

thoughts?
Regards,
Chris