Affiliate Software choices

My Golf website will be launched on April 17, 2001. From day 1, I want to have an Affiliate Program in place (selling e-books, promoting free newsletter etc), because from what I have read, it is one of the best ways to advertise. Anyway, has anyone used any of the following to create an Affiliate site :

1. AssocTrac - Corey Rudl is the author.

2. Groundbreak.com.

3. Clickbank.

I am thinking of buying Corey's software, even though it is much more expensive, but, from what I have read, he has me convinced that his product is the best. Comments are welcomed. Thank you.

Ken Black
[email protected]
http://www.golfrevelations.com