I agree on Godaddy.

Enom has a nice interface and good prices, though I don't trust their DNS or email (occasional outages).

Also,

- If you just click the "email" select box in the UI, it can drop your custom MX record, even if you don't hit save.

- If you use their DNS hosting for an outside domain that expires, they point to an advertising page and it's hard to make them switch back.

I use enom as well and one of the things I hate about them is the constant attempts at up-selling.