John,
Will there be any ambulances coming up in the future? I know many collectors, myself included, like to "round out" existing departments with new equipment(ie Las Vegas FD, Clark County FD, LAFD, etc). Another idea would be new, non-fire based(3rd service, county run) EMS departments(ie Austin-Travis County EMS). There are hundreds of county run EMS systems to choose from, not to mention a large number of prior FD's Code 3 has made that can be added to.