I wonder about people's priorities in domain name registrations, and I am asking you here to tell about the domain resgitrars you use and trust.
I shall begin:
The most favourite one is sibername.com - I like them more as a host than as a domain registrar, but their services are trustworthy anywhere they are applied.
Second one is eurodns.com - IMHO the best source for country code top level domains. Often discounts and stability.
Usual godaddy - cheap and simple. Fast .coms or bulk reg comes here.
Also used name.com., directi, enom... Nothing special. just usual registrars.