Coldcalling potential SEO clients

Hey Guys,

I'm from a Web Development company, and we're now moving into the SEO space.

We have a very large client-base already (in the thousands), and I'm leading the charge for SEO.

We've done an eDM announcing our services, however I'll know be calling all of our existing clients and offering them SEO services,

We're incredibly price competitive in the country I'm in, and have a great service.

What I'm wondering is, does anyone have a decent cold-call script, or even some decent statistics and facts on the benefits of SEO. I have no problem explaining the fine details if hit with those, it's more the high-level benefits and way to approach winning this business,

Cheers,
JC