Choosing an SEO Company?

According to Google’s Webmaster Guidelines these are some things you should consider when choosing an SEO Company.
1. Be wary of SEO firms and web consultants or agencies that send you email out of the blue.
2. No one can guarantee a #1 ranking on Google.
3. Be careful if a company is secretive or won’t clearly explain what they intend to do.
4. You should never have to link to an SEO.
5. Choose wisely.
6. Be sure to understand where the money goes.