at any time in the future you can check the best PR-juice ones this way:
- take an article from one directory
- search for a specific whole sentence of it in google (search in quotes though)
- the results are sorted the way google weights them ;-)
- check the first, see if it is "juicy" or has no-follow - if yes, you got the best one at present time for this niche, if not, check the next one and so forth
Hope that helps!