I favor the factory clip over deep carry clips with the Sebenza. The factory clip has reached a point of retention versus pants destruction that I consider to be an optimal balance, and the Sebenza's compact nature largely negates my normal preference for a deep carry clip, especially considering with it being slightly above the pants line it gets a bit more stability. I love the look of the old style CRK clips, but the current clip which creates two points of contact is really function at its finest IMHO and it is one of the reasons I can personally justify the price of these knives!
In terms of looks, you really cannot beat the Millet clips and owners absolutely love them. Another option beyond aftermarket clips is getting an OEM clip anodized...