Mageworx makes many of the best known Magento extensions, including SEO Suite Ultimate.
Amasty offers many great “back-end” extensions which help manage a Magento Store. They also have Improved Navigation, which is the best filterable navigation we have seen for Magento.
Our Recommended Extensions from AheadWorks
EKG Marketing is Premier Google Partner which means our account managers passed AdWords certification exams and have access to exclusive support support from Google. This allows to offer our clients the latest Google technology updates before other agencies can.
As a Bing Partner we tap into a sales channel that many agencies ignore. We actually have clients that make more gross profit on Bing than on Google!