What I care about is being listed on a LL that either sends super high quality traffic that converts OR on a category page with no NEXT pages, you know when the first page shows the 20 latest links and where your link will eventually get buried in the backlog.
PR is not as important as the relevancy of keyword that is used for the backlink - i.e. your free site title
Also, 1 Linklist is NOT ENOUGH
15-20 is better, but no free site mirrors! Again, if you hope to get a quick sale off the initial traffic - then mirrors and submits to more link lists would *PROBABLY* work better for you...