Can anyone recommend a free / cheap full featured directory script that I can use to create my new directory?
You can take a look at PHP Link Directory script review here http://www.webdirectorywatch.com/web-directory-scripts/php-link-directory.html and see is this script something you would like to use.
check cplinks: http://www.cplinks.com/ creates static pages which are highly search engine friendly, load fast and can deliver huge numbers of links and page impressions with low server loads
This might work for you. http://www.umailcampaign.com/directoryscript.aspx An example of which is - http://www.uuiq.com/ I think a member here created it - zguoqi I'm using phplinkdirectory myself. Good luck
I searched Google for "asp directory script" and guess who's on top? DP! here's the thread and the relevant url
I've used some of those DUWare scripts before. They are done fairly well, and you can't beat the price (free), but I'd give them only a 6/10 score overall. I had to heavily modify their classifeds script to be anything real useful and secure.