B+W Variations, a component of The Variations Suite tackles the tricky problem of converting colour into monochrome. Eight different treatments are available simulating different colour filters, Tri-X film and with options for adjusting contrast and adding grain.
It's often difficult to choose what looks best in B+W, so the script's ability to create and save multiple previews with different options can be very handy. You can add a description to each set of previews, so you won't lose track of what you've done.

All the scripts in The Variations Suite work in a similar way, please refer to the instructions for installation, use and batch operation for a full explanation.