We are resellers for www.rapidSSL.com and find them very good. They own their own root, so the certificate install is very easy. Their prices are excellent, and they have no links to "other services" that might steal your clients away.
Be sure to ask them for the html/php code necessary to generate a "Quick Invite".
Want to sell domain names? Sign up today for an eNom.com reseller account from a trusted eNom ETP provider. * We provide support and service to over 3245 happy eNom domain name and SSL certificate resellers!