I think the best time to buy BCH is 10th August or even later. If market reports are to be believed BCH will go crumbling down from 8th August onwards.
http://uk.businessinsider.com/bitcoin-cash-price-and-bitcoin-price-2017-8?r=US&IR=TI think you should buy Bitcoin cash fork sure. I believe that it is the strongest competitor of Bitcoin right now and it will show an amazing rate of growth in future. ETHEREUM is also a great crypto to invest in.