I am currently with HostGator.com, and have been for a while. I started with their regular reseller hosting but recently went to dedicated. I have used many companies in the past, but none have given the support and service that HostGator provides. Every e-mail is answered within minutes (even at 3am) and all support issues are taken care of very quickly. Anyone looking for a dedicated server or any other hosting really needs to check them out.