I was in Italy for the last couple weeks and went on an amaro binge. Basically tried anything I've seen in the States and never sampled, along with any local variety that was on offer. It was always fun watching the bartenders blink at the American ordering amaro, must not be that common. Had a couple actually double check my order.
Drank a lot of Montenegro. Seemed to be the most common choice for the Italians too. Really enjoyed Branca Menta, hit the spot in the heat. I had one that was fantastic but wasn't sure of the name, never saw the bottle. I think it was one of the offerings by Nonino. Heavy grappa profile, orange, cinnamon. Good stuff.