Alright guys, I've posted this question in several places. I keep getting mixed messages. So finally, I got off my butt and went right "to the source". I called up the district magistrate office in Pennsylvania where the original citation is filed. I asked them, they said it wont be a problem because a summary offense is just like a "write-up" its not a misdemeanor or felony and therefore, technically not a crime in Pennsylvania. I secondly, called the Pennsylvania State Police barracks where that officer was that cited me. I specifically spoke to him and he said that he does not know about NJ but in PA that would not prohibit me from purchasing a firearm.
Now of course, those people were in PA, so I didnt stop there. I took a trip to the county police, where handgun permits apps are submitted and their fate either granted or denied. I spoke to the Sargeant nonetheless and he said that because the grading of the offense was not a misdemeanor in PA, its not enough to prohibit a gun permit. He said in NJ it's a misdemeanor (disorderly persons offenses, you guys call them here) and thats why it'd be a problem if it happened in NJ.
The last person I talked to, happened to be in charge of the domestic violence division there. His words were, "If that were to have happened in NJ, you would not be charged anyway, because he threw the knife at you and punched you, causing injury, you twisting hit wrist and pushing him off you, you were defending yourself, you would still not be charged here in NJ." He then confirmed that, even still, its not a conviction, its a citation, and that if it were "true" domestic violence, I woulda been arrested, fingerprinted and have had something put on my record.
So it appears, answering "no" to the question, "Have you ever been convicted of a domestic violence offense that involved the striking, kicking, shoving of another?" is the correct response, since (a) it is not a conviction, (b) it was not considered domestic violence, and © anyone who would look at the details of what happened would come to the conclusion that I was defending myself.
Sooo, I have my answer now. Thank you everyone who took the time to respond.