The Big is only challenging because it is high risk. The skiing itself is not very hard. As far as steepness goes, its steeper than the Wave wall, and most of the A-Z chutes, but not by much. But you also have to have Avy gear and a partner, and if you are not on first tram, you might not get a time slot.
The Wave wall will probably be decent, but I heard the gullies were a little scoured, and the A-Z chutes stayed almost untracked all day (the uppers anyway) so they are probably still good too. But since its Big Sky, the snow might have all blown to Moonlight, or you might get a fresh 2 feet.
Have fun!