Most of the steepest / techy inbounds lines I've skied have been in Crested Butte but that's also just where I've spent the most time. East Wall at A-bay is always a blast, West Basin in Taos feels very similar to CB, and I didn't get to ski many of them when I was there, but some of the lines around Mt Baker looked super cool.
CB's most ridiculous lines rarely open (Body Bag, Big Hourglass), but it's definitely got its fair share of puckering areas. We have very few big cliffs that have long and/or open runouts, but given how generally steep, tight, and rocky it is (and that the dry snow here doesn't stick to shit), the common claim to fame is that it's got some of the scariest 10-footers around.
Lil hourglass is pretty puckering, especially when the runout after the air is firm. The Edge is ~100-ft of legit-steep, billy-goating fun with tons of different line choices. Angle Gully is great for seeing how little you care about your bases, or needing to run out through moguls. Fredo's has some of the best airs with actual runouts, with some techy moves required to get to most of them. Staircase and everything off Sock it to Me ridge is awesome, and just about the right balance of challenging but not totally terrifying. Horseshoe is cool cause it's easily lapable, will kind of form spines / pillows on a deep day, but is always sharky. Then there's Rambo, which is kinda just goofy — supposedly one of the steepest cut runs in the U.S., but they keep all these little saplings there so it'll hold snow, and keep you very cognizant of not catching an edge and high-siding on one of them.
Staircase:
Rambo:
Headwall w/ Angle exit lower right
part of Fredo's after a storm:
Horshoe the best I've seen it:
