I am not fimilar with any of the scripts, however, a script is not tailored to your specific business where as an
SEO firm works with the client to design a system that works well for each client. At the same time, check out the scrips if they are inexpesive and what do you you have to loose?
I do know the guys at ClickSquad personally, and they are excellent at what they do. Take a look at the scripts that are out there and give them a call, which ever one you feel suits you best go with.
There is not a one right solution.
Good Luck,
Gregory Van Horn
Founder & Senior Developer
Transcend Media Interactive Marketing & Development Group