I dont really believe that bitcoin cash will rally increases rapidly as most is pumping its price now. You can buy bitcoin at anytime because it is still a future of it because this is the original one and bitcoin cash is just a copycat and no right to be on the top. Mostly have decided to invest on bitcoin cash but in limited states. The support is still small and the community is not doing it all.
Maybe the OP really want to buy bitcoin in a lowest price and i think this is the time to buy or you can wait for another day. Who knows ? Maybe the bitcoin continue dumping for this week. And this is your chance to buy bitcoin in a low price.