[jdrmar]

I'm coming from a bit similar situation and I decided to build something for this. Basically I see the domain registration itself as a commodity service (ie just go for the cheapest one), and then DNS management etc you can do through a common interface. A way to achieve this is to:

  1. Register the domain at whichever place is the cheapest. 
  2. Set the nameservers to the ones belonging to the DNS management service. 
  3. All domain name management can be done from the DNS panel at the DNS management service.

Not sure if I'm explaining it clearly, but please have a look at our service at https://dot.bs if you're interested. We're comparing a 140 domain registrars on price and provide the service I described above.