The first few versions of the Cannondale ST400 had caliper brakes, while the ST600 and ST1000 had cantilevers. The frames are essentially the same, except for the cantilever posts. They all have a full complement of rack, fender, and water bottle mounts. In 1990, the ST400 got cantilevers. The downside is that that limits you to 27 inch wheels. I have a 1990 ST400 and, to me, it seems like what a good sport touring bike should be, light and stiff. I have never tried it with a full load.
1990 Cannondale ST400