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I see where youre coming from. Free traffic is good, and directory listings are relatively stable.
IMO many directories are getting niched into geographical or categorical sites. For instance, a site in the UK offering business listings, or a "links page" on some respectable site.
Its pretty hard to tell the difference between your "stamped authority" directory and the niche sites that deal with a particular subject area. IMO a good bit of traffic lies between your standard link pop and directories/SE's.
Its just the way I 'see' it, but if you lookup directories + your keyword you might find a few directories that you otherwise missed
You can also look at applicable categories in ODP, and see if there's a Directory subcat.
Good advice. Although the traffic can vary widely, in my little niche if you put the trickle traffic from several of these together, as a group, they can out perform Ink or Fast. The traffic tends to be prequalified too. Worth checking out.