You can sell it now in bittrex it is a good exchange to dump your bch in my opinion. Also, it would be nice to dump your bch on poloniex on August 14, there is still a chance that it would rise in price but if you really want to dump now dump in bittrex. They dont require filling out tons of info or bank verification crap, just deposit, sell then withdraw. At least thats how it goes for me I dont know if it is done in bigger volume if bittrex would require those.