Which speedlight is better for Nikon D3100?

I'am planning to buy a speedlight for my Nikon D3100 unit, but I don't know which one to buy. I plan to use the speedlight for everyday use. So far I checked the Nikon sb600, Yongnuo YN467 and Nissin Di622. Which do you think best fit my unit and needs or do you have any other option for me… Thanks a lot.

Might as well get the one that is the same brand as your camera (unless for some reason the other ones have a feature that the nikon does not have).