Third choice as for me at this time. Another great place to spend some money if you are looking for back links.

Address: http://www.linkspub.com/

Advantages:

1. Very good directory, great inner linking gives you at least PR3 at every site.

2. Still active.

3. Fast response.

4. As for advertising - good prices and fair information. You know what you are paying for.

Disadvantages:

Amount of back links that you get from advertising at this directory could be a little bit bigger:)

But it will be never enough so I can say that there are none disadvantages at the time being.