Steepest inbounds run in summit and vail valley

Palavanici is nothing compared to Lake Chutes at Breckenridge. Part of the Lake Chutes is really mellow but if you traverse further down you get to pretty gnarly stuff. Several meter cornice drop landing on a rock-laced 50-something degree face. Or if you prefer narrow you can keep going past the couloir type thing, until right before you get to the gate to the next area (Snow White if I recall correctly), then there's a cool chute that's like 2 meters wide and pretty steep. Exit can be tricky depending on conditions.
I've only been to Breckenridge maybe two times ever so I don't know what condition that stuff is usually in, but when I skied it, it was really awesome. Check it out.

The area with the cornice drop onto a rock laced face is the area called Vertical Cornice and Crazy Ivans in this pic, and the narrow chute is called Wacky Tim's (it was narrower and rockier when I was there). I don't know how accurate the names are in this pic, just going by what it says.

Get to it by hiking off the top of the highest lift (Imperial if I remember correctly)