cd88, i don't conceive of them (rightness and wrongness). sure, i've had those ideas stuffed down my throat over the years from hierarchical institutions, family, church, and so on, but i reject the idea of right and wrong at this point in my life. i work diligently at removing the words from my vocabulary.
perhaps this explanation may help....i do have a concept of pain - physical, emotional, and mental. and when i think about how i want to live or what actions i desire to take, i often take into account my perception of potential pain and suffering (to myself and/or others, the land, animals) that might result, and whether i think that pain will benefit or harm those involved, directly or tangentially. but i see those distinctions as subjective to me, rather than falling on a side of right or wrong.
those perceptions have changed over the years based on my experiences, and on stories i've heard and witnessed from other people, by both thought and intuitive processes, sometimes via dreams, other times through reading, and so on. actually, those perceptions change all the time, depending on the situation and the people and things involved. operating this way feels much different to me than thinking and acting based on conceptions of right and wrong, and i have felt happier and freer as a result.
dealing with other peoples' concepts of right and wrong still presents plenty of challenges for me, as does dealing with my own semi-brainwashed mind. :)
edit to add: regarding the original question, i agreed with your answer of "neither" because i don't desire the concepts of either vengeance or justice. i never even use the words to describe my life or thoughts - much like right and wrong, they have no meaning for me other than what i think other people mean by them (if you know what i mean!).
after a little more reflection, i'd say i do have a meaning of vengeance, but i just don't desire it as a way of reacting, although many times i've felt like i wanted it momentarily. ultimately, i want healing from pain rather than vengeance. justice, on the other hand, has no relevance to my life, since it seems to come back to ideas of right and wrong.