There is no harm taking a small punt on a number of coins: Ether, Bitcoincash, Doge, Monero, Dash.
Do your research and try not to pay too much. Have a set point where you start to cash out profits. Pretty soon you'll have made yourself some more bitcoin.
I think all these coins are OK. But bitcoin cash could also be a good back if the Segwit version of the bitcoin fails.
Most holders of Bitcoin already hold equal amounts of bitcoin cash. Not all bitcoin cash has been dumped at exchanges. You have a natural hedge there - if scaling issues pull down Bitcoin, bitcoin cash will rise.