There have been several good threads about it here, if you search for godaddy (as that's the most mentioned one) they should come up

I have all mine at namesecure, namecheap and one and one.

Make sure to check the features that are important to you, many registrars no longer e-mail forwarding as part of the package for example, they say to "prevent spam" but it's to get you go purchase that for more money.