After bitcoin Ethereum is the next promising coin. Currently, Ethereum is the second most popular coin and is very stable, so don't think for long and do it.

The market right now favours the buyer more than the seller. So go get as many ether as you can afford and I am sure you will be glad you did. There are speculation in some quarters that ether may reach 2k this year.

The growth in the value of Ethereum has a better potential than other top 5 altcoin.