Stowflake Inn is supposed to be very nice. Never stayed there.

Equinox is also very nice, but I'd rather be near Stowe than by Manchester, which is full of shopping outlets.

Three Mountain Inn in Jamaica Vermont (15min from Stratton, 40min from Manchester) is my favorate inn in the world (seriously). It isn't a place for kids though, and is small so probably not what you are looking for. But the real highlight is the dinner there. Truly amazing, the chef prepares each meal himself in the small kitchen, and most ingredients are from local farms that he picks up in the morning. It beats anything you can get in the fanciest places in Manhattan, and is a tremendous value for what you are getting also. I highly recommend!