Registered Black Angus show heifer, how much at a livestock sale?

I have a show heifer that was born september 7th of 2007, shes registered and i have the papers for her, im only 16 and ths is the first time ive done this. i showed her 2 years in a row and now i want to sell her. she probably weighs around a thousand pounds my guess. My Ag. teacher said shes worth about 1700. but i hear the price of beef is horrible. how much money would she bring this week at the sale?