NeXt??
GoScript is $195, and there are several other PostScript script software
clones in the under-$500 range for the PC. There are one or two for the
Mac, too, including a screen-viewer. They have screen-previewers for HP
LaserJet output, too. Unfortunately, most are slow, and some are buggy. A
recent computer magazine in the pile on my table has a comparison of
several; none were perfect as a LaserWriter, unfortunately. I know several
people running GoScript on their BridgeBoards, and it's rather slow, and
woofs on big image operations.