Hello Brian,
your requirements are specific I think you need to use PBR to be able to send the packets coming from 10.2.1.4 TCP port 1494 to the DSL link.
But here you have NAT too.
access-list 135 permit tcp host 10.2.1.4 eq 1494 any
You need to use a route-map that will set the outgoing interface to dsl in its first block
the following link can be useful:
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080093fca.shtml
it explains how to use multiple nat pools using route-maps
Hope to help
Giuseppe