Totally independently of their SOPA stance, I would recommend Namecheap over GoDaddy. I've been using Namecheap for years; they are reliable and have a sane (if not terribly pretty) user interface.
I switched to Namecheap after I got bit in the ass by the RegisterFly fiasco. Namecheap has been great to me ever since. I highly recommend them, despite their spammy-sounding name.