Theres a few that I like for different reasons:
NIN two years ago in Davis, Ca. They did a few small shows and were just warming up for the big tour.
Marilyn Manson at Ozzfest a couple of years ago. First time seeing him and he's one of my favorite so it was magical.
David Bowie a few years ago. It was a concert that one would describe as beautiful.
Motley Crue about 7 years ago. It was out doors and raining at a small venue. Tommy was just out of jail, Nikki jumped of stage to get in a fight with someone. It was just a big party with the Crue.