This is my second choice. If you have some money, want to buy advertising place, you should look at: http://www.search-group.com/

Advantages:

1. Advertising prices are really good.

2. Directory is active.

3. Very fast response.

4. Directory is really visible in many places. So it can be easily found, so your advertisement also.

Disadvantages:

As for me directory submission prices don’t match link quality.

Summary:

If you are looking for back links this is your site!