The ultimate company to register your domain, and even hosting with it is no doubt, Namecheap
We are lured to think that the best domain’s registrar may be GoDaddy, but this is totally wrong.
I have registered this one with quite another registrar and I’ve paid also some commission. The difference is not very notable, but when one manages a few domains, the difference may pay some other required fees. I found Namecheap very reliable. Please visit and decide for yourself.
This page is very new, I was not aware of Namecheap at my beginnings.