2 my favs:
Domain.com
NameCheap.com

My favorite is the godaddy.com there is often a very good stock, and .info domain price always is 0.99$

This thing should become a Godady versus namecheap and I would not defy merchants that claim Godady is king but I also have to say that Dynadot.com is also remarkably excellent so you bet that Im not just talking because if you use it you will never be desapointed because recommendation came from zoom

I prefer Hexonet.

Well 1and1.com and netfirms.com are good options.
HostGator and HostPapa are very cheap but reliable too.

register.com

As most guys recommended here,godaddy and enom are the most popular registrar. Except that ,you can have a look at register.com ,namecheap.com or others.

I always use GoDaddy. It's reasonably priced and they are so big, they are always going to be around. Plus, I think their support is pretty good.

Godaddy's CP is just more confusing than it has to be. I always used namecheap until I got my enom reseller.

I personally like Enom especially if you have any type of reseller intentions. Their reseller service is phenominal.

you can check out enom and reseller club

What about domains.com? I notice that it's extensively advertised a few months ago. Is it a new registrar? Any of you ever tried this registrar? Care to share your experience here?

Enom and Godaddy