Put everything on Ethereum because in few weeks from now, ethereum fork would have been over and the result of fork will definitely spark a bear run or bear party! I am sure the increase in ether price will be sustained and when people realize the opportunity that fork hss created, people will jump in to buy more ether!
I doubt that the price of ETH will fly up after the fork. Most likely people will start selling Ethereum after that and the price will go down.