List books are always controversial, and everybody has an opinion on where the authors missed the mark. In the Alka thread, lots of folks were questioning why certain lines made the cut. Personally, I think the Silver is a blast and super classic - albeit probably not top 5 in CO...
So, this thread is a chance to come up with the 51st through 60th classics, and/or bitch about ones that should have been scratched.
I'd add for consideration (only contributing for places I've lived):
1) The Dragons Tail in RMNP. Strikingly visible from the most popular TH in one of the nation's most popular national parks. Outstanding skiing and aesthetics. CO's front range deserves a classic, and no routes match DT for that criteria (that said, it isnt my favorite couloir in RMNP, just the most classic)
2) I think Long's, as CO's most famous mountain (arguably) deserves a shout out. It's hard to give Cables classic status for 800' of skiing, but it's a damn fine 800'. Position is incredible. You get to ski a historical climbing route with a 5th class crux. Classic.
3) Liberty Ridge on Rainier. I haven't skied the Finger, but from a pure aesthetics standpoint, I wouldn't have given that top 5 on Rainier, let alone all of WA. The finger looks like somebody stuck a 2k' Colorado couloir in the middle of Rainier. I thought Lib Ridge was the finest quality ski descent I've seen or skied in the lower 48. Plainly visible from the Puget Sound metro. Long, continuous, exposed. Deserves to be in both 50 classics books.
I'd love to hear what folks would add to WY, CA, MT, BC and AB. I thought the Mendenhall in CA was damn cool and historic. I'm not well traveled in CA, so I'm sure there are many others more deserving than that.