Need Recommendation: Append E-mail & Telephone

[Lucas Machado]

Hello,

I am looking for a recommendation for a service to append e-mail and telephone addresses to a list where I provide first name, last name, adress, city, state, zip.

Here's the thing: I've used other services in the past that just have too many mis-hits, dead phone numbers - or that simply charge way too much.

I'm looking for a service that has quality control on the telephones and e-mails, and either charges .10 per check or .15-.20 per successful match.