ABA, I certainly understand why both the reasons you stated have led CU fans to dislike Nebraska (even if the Sal stuff was a small number of fans, it was disgusting enough for me to understand a lot of the bitterness). I would say, however, on the Ga Tech thing that Osborne was simply one vote along with many many other coaches who thought Ga Tech was the better team.
He did play both teams, and I don't know think he would be petty enough to take away a national title (which would help the conference image, no less) for no reason. Remember GT was actually undefeated (1 tie), while CU had a loss, a tie, and the 5th down. I think CU certainly deserved a share of the title for winning the Orange Bowl, but its a stretch to say they were clearly more deserving than GT.
Anyway, I do think CU is, on the whole, our biggest rival in the North, and will probably grow in stature over the years as memories of the Big 8 fade. Hopefully both teams can improve and make it a nationally known rivalry. I have a lot of respect for most the CU fans on this board, so I do wish a lot of the stupidity in terms of stereotyping each side could die down from some of the more ignorant fans I hear about.
Granted, NU fans (the older ones especially) do have something of an annoying "holier than thou" streak, and CU fans (the drunk younger ones) did confirm every suspicion NU had of them by trashing their own field in 2005. But what's a little hatred amongst friends. November 28th. I hope to be there this year.