Breck is a real town with bars and restaurants on real streets, not in a planned "village" so it might be more fun to get around and explore if you're staring there.

Any of the resorts will have a good amount of the terrain you describe. Copper has a some killer bowls, and if you get the chance to do Vail, you should. Vail's HUGE. Don't even bother with the front side at Vail. If you have a couple of beginners then Copper has a good set of faster greens mixed with some blues that'll keep everyone entertained.

FYI- Black runs in CO tend to get bumped out pretty quickly, which is nice if you're into that. I'm not.

Try not to drink too much your first night in town, the altitude will make you a cheaper date. Drink lots of water.

Enjoy.

ETA: Mineman, I don't think they're core based on the initial post. If you wanna guide them in the backcountry, feel free, but I wouldn't want to send a bunch of midwesterners out there without a guide or training.

BTW, what days off do you have? I usually get about 30 days a year but had to cut back last year. Not going to make that mistake again.