The HexHighlight script is a much better solution! http://www.vim.org/scripts/script.php?script_id=2937
All cterm styles were generated using Shawn Biddle's Vim-toCterm script: http://shawncplus.github.com/Vim-toCterm/ Have tested using a 256 color terminal (iTerm), and the result looks good. OS X Terminal has only 16 colors, so Mac Classic is still no use there.
Sorted colors used by Mac Classic by dark -> light, in color groups. Some of the colors are too similar, and should be merged. Can now see which ones.