If you have money, it is a good time to buy at the dip. It may not be long before the funds that you invest double. I would buy ETH for 80% of the capitals, and the remaining 20% would invest in EOS.
You are right with your ideology but you are missing out the basic principles of investments : diversification. Yes, you must not invest 80% into one single opportunity as in the case of it will fail, the rest of 20% may not help you to overcome your losses to get back your capital and profits. I am not talking just because of ethererum but you must diversify more to ensure that you will have a balanced portfolio.
When Ethereum dips this low you can't possibly go wrong with it's future value. ETH is going to change the way the financial world deals with money. Buying ETH today almost guarantees future returns.
I agree ethereum may bring changes to this world but its unlimited supply makes to think twice before making a big investments with it. It is a premined coin with inflationary features. When whales decide to cash out their ethereum then small investors like to myself may need to bite the dust. If ethereum is a fairly distributed coin with limited supply then no-one could argue against it.
Following ETH i'd go with NEO. Seems to be one of the first and most established POS coins.
I do hear many people are suggesting Neo and I guess it is good enough to be considered for holding up for years but my only concern about it is, it's price levels are more than 2 mBTC whereas I look for coins which are cheaper than 10k satoshi.