I'd put my energy into affiliate forums before directories.
Affiliate directories won't pull many affiliates and there are only about 10 worth submitting to. I'll give you those in a sec. But directories used to be OK for recruiting and now so many are filled with junky programs or aren't kept up to date, so few affiliates go to regular directories looking for programs.
Here are the only one's I would bother submitting to and I'd only do these if I had extra time on my hands, because I don't really know if they would do much good.
Not that PR is everything, but here are the top affiliate directories based on Google PR. I'd do the top 10 or so.
However skip 5 Star which is listed as #4 and we do have a directory, but it's exclusive and we don't take regular submissions. One of the others on the list is for casino affiliate programs so you can skip it.
Google Directory > Affiliate Programs > Resources > Directories
Hope this helps and best of luck!