Domain names: In my experience, Namecheap has the best prices consistently and the best customer service I’ve received from a registrar.
Web hosting service: the Small Business Transcriptionist is very happily hosted with Reliable Webs, where you’ll get personalized customer service from an actual person who actually reads and responds to your service tickets instead of the copy and paste email responses the big box hosting companies send out.
Email list management: I’m using Aweber right now, but I’m looking into testing out some other services.