+1 on Crudmeister and the others' comments
We like Breck, tend not to go above treeline much, so may have some common perspectives.
Easy one -- food: Peak Nine not only has the best food (to us at least) it is also substantially cheaper than the other places.
We like 7 for warmups, but does get quite crowded...my kids have always liked Ore Bucket for fun trees/bumps -- can't see it as a black, but it is Breck. Liked Peak 6 actually, but each time have skied has been VERY windy. Some have complained on the switch from the lower to higher chair, doesn't seem to bad to me. We tend to move from 7-9-10 during a day skiing, then take the Super-Connect back to ski down to the gondola lots, not an issue for you staying in town.
Peak 9 normally has a nice mix of runs, esp. considering how you labeled your group. Mercury mid-mountain chair is usually the least crowded. Agree on the difficulties cited for various runs, really like Briar Rose too.
We really like Peak 10, normally hardly any crowds, and is a lot of fun for the 3-4 runs near the chairlift. The wind i really notice is the last 100 meters or so of the lift, you hit a little valley there and the winds seems to really hit the chairs.
If you branch out for some different / higher runs you can get from Peak 7 over to the T Bar, Pika is fun but can be windy, or take the catwalk from the T Bar to the south over to the top of 6 chair -- runs are fun over there -- in my limited experience, not really steep, just not groomed.
Final point. Hydration is key. Have lived here off and on for 11 years, and can bite you easily. We tend to over-hydrate, and i have a liking for a couple of Ibuprofen to start the day. Breck is high to sleep if you are coming from near sea level -- but that effect is seemingly impossible to predict.