You're correct, my friend. Ethereum is one of the strongest altcoins available on the market right now, as it has been proven and tested for quite some time. It has a very prominent development team, and a highly supportive community. It's also the leader in ICOs and Tokens, compared with most smart contract platforms in existence. I think that this period of massive declines in prices, it's perfect for making money in the long run, especially when investing into Ethereum. Now, it's only a PoW coin, but it will shift to PoS, giving you the opportunity to multiply your profits with the ETH you hold in your wallet.
Maybe once ETH makes the switch to PoS, then it's price will greatly skyrocket as everyone would become interested in buying Ethereum not only for interacting with the most popular dApps in existence, but also to earn some passive income in the future. What's most exciting about ETH is that a new wave of "stake pools" might emerge in the future, allowing anyone to earn Ethereum even if the minimum amount of coins for staking is not met.
On the other hand, NEO is also a good altcoin worth buying because it generates you free "GAS" over time by simply holding NEO in your wallet. Not only that, but several interesting projects are being developed in NEO such as HashPuppies, Ontology, and Trinity, which will have a positive effect in its price within the future.
Whichever coin you decide to invest into, make sure to read all about it, such as current development team, long-term goals, and technology, to ensure that your investment will be safe in the future.