Diversification, even in this high-risk market, helps reduce risk and maximize safer earnings.
It is recommended to largely weight in on Ether, with some in Bitcoin.
Other coins like Litecoin and Ripple represent enormous opportunity and should represent part of your strategy.
Smaller "alt" coins have tremendous potential as well and should represent some of your portfolio. WTC, VTC, and VEN are good places to start.
I disagree most of your money should be in bitcoin and not in ETH just look at the market dominance of bitcoin, it is still growing despite being very high already and whatever happens with the decision of the SEC is going to make that dominance even higher, also adding smaller alts could give you profits but in that case your diversification is adding risk and not reducing it, something I am against.