There are so many scraping tools out there now where you can get the persons business email address and direct contact numbers, do a Google search for data scraping tools and Voila......
Personally I would never pitch below a "Head" of department, preferably regional or global head. You then have Directors, VP's, SVP's, MD's and CEO's.
Basically anyone who has a budget and is allowed to spend it without higher authority approval is what you are looking for, job titles change depending on the company and it also depends on how large a company you are targeting so make sure you do your research before contacting them......
This not only applies to Domaining but for any sale........