I looked at you pictures (that is a very nice credenza). It looks like from the picture where the back of the credenza is shown, that you need to route the cables through the large predrilled and finished holes either down or across the back into another bay. Is that correct? If so, I believe the Monoprice premium RG-6 based cables would easy be flexible enough. They are certainly cheap enough that you shouldn't really be hurt by ordering one and testing it.