Mike_Feury - 8:16 am on Sep 13, 2010 (gmt 0)
Someone else mentioned namecheap, I'll have to check them out.
Another vote for Namecheap here, I've had hundreds of domains with them for over five years. Clean interface, reliable operation, I'm quite satisfied there.
I was with GoDaddy for a few years before that, but left because of trust and interface issues--I didn't like wondering what other surprise might be waiting, not with that many domains. I hear they've cleaned up since though, so they should be okay in recent times, if you don't mind the marketing.