Couple of other comments:
Breck crowds: skiing pres weekend? MLK weekend? then yes - expect some crowds. Rest of the week? quite pleasant.
I just skied vail from Xmas thru new years - most I waited was about 7 minutes - and that was only once at the base. Rest of the lifts were 1-4 minutes. At steamboat now - minimal lines, I expect more this weekend - MLK weekend, but has never been awful in the past. (my 3rd mlk weekend here)
"Hard trade" - hard to trade INTO Colorado. 1) you need decent size weeks to trade in for ski weeks (22-32 TPUs on RCI) if not a holiday weekend. 2) Not a lot of weeks get deposited into RCI. Need to plan and be patient and flexible. Can't speak to other companies. You will NOT see a Wyndham Avon, never seen a winter Peak 7 or grand timber - except on the RCI rental side. Steamboat not as hard in RCI as Breck and Vail/Avon. (Plus you have the wyndham points options) (I don't do Aspen/Snowmass anymore)
Wives don't ski: Personally I don't think ANY place would be better than another - Breck and Steamboat have the best towns, but People watching in Vail is pretty good. How much can you shop and visit the town? All have someplace for a massage, get your nails done etc. So that shoots a few hours. All will have great places for breakfast / lunch. I would not want to be driving anywhere from any of the resorts "to do something else". All will have snowmobile, sledding options.
Green/blue/black - disagree with a poster above. I find that "black" in the East, is blue in the West. I also find that "black" in the west can range from an aggressive blue to a really hard black. I don't do labeled double diamonds. Agree you see much more ice in the east. If you can ski the east, you can easily ski the west. That first powder day will be a leg buster !
Getting to steamboat: Hayden airport - very convenient, easy drive, shuttles available and reasonable. Not so great if the weather is bad - might not get in. Flying to Denver and driving - 4+ hours. Weather bad? add time. really bad? Pass might close (FYI berthouds was closed last night due to avalanche control, Rabbit ears was open but really slow - had very high winds.)
FYI - My favorite for non-skiers - Jackson Hole. Great town. Elk reserve. Showmobiling, dog sledding, small art museums, cool "animal art" museum, Day trip to Yellowstone - awesome winter tour - highly recommended, day spas, Tram to top, admire the view, go back down, same with gondola - up, have lunch, go back and people watch. NOT GOOD if they want to learn to ski. Skip JH if that's the case - not enough good greens, too aggressive blues.
FYI - I ski 8 weeks a year thru RCI. This year January is: Dec 30: Vail, Jan 7 - 21: Steamboat , Jan 21-28: Breck , Jan 28 - Feb 4: Vail
I have an epic unlimited, and a steamboat 8 day as well.