I voted Selina. I like Zee with him too, but Selina's my favorite match for him. Blame The Animated Series.
I think it was also heavily speculated at the time this was revealed that it could have been the wedge that drove Dick and Bruce apart.
I think this is made explicit in either comics or an episode... something about Dick partnering with Tim for a bit and some backstory being filled in about how Bruce and Dick became bitterly estranged, between Bruce being controlling and Barbara falling in love with him despite the age difference and her prior relationship with Dick. I always liked Timm's Nightwing, even if he was more bitter than the comics version.