Hmm...I'm not sure I'd want any of these.
I don't think I'd want to live in the repressive governments/cultures of the Romulans and Cardassians...nor would I enjoy the hyper-capitalist culture of the Ferengi or the strong emphasis on violence in Klingon culture. Which I guess leaves the Bajorans and Bolians (both starting with B, interestingly :-P), but I'm not totally sold on either. With the Bajorans, I suppose it'd depend on when exactly you'd be reincarnated--if you can do it during their glory days, then maybe--but I dunno. And no offense to the Bolians, but they've never been particularly interesting to me.
Not to say these aren't all still good species to have populating the Trek universe, as they all fill important story-telling/world-building roles...I'm just not sure I'd want to actually be one of them too, y'know?
I'm sure there is a species that would interest me to be out there in the Trek universe, but I can't think of it off-hand and don't have the time to do the lengthy search through all of the options (Trek has built up quite a list by now) so to figure it out right now.
