It seems pretty much confirmed we can see Ethereum going under $400 these days.
Qn - Is it a good buy under $400 or wait for even more price drop?
In this January ,the price of Ethereum crossed 1100$,now the value of ETH is 1/3 of the Jan Price.So I think this is the best time to inverse in ETH.When the price increases to 1000$+ ,you will get huge amount of dollars in your hand.
Still you wait for the drop means,you are face to buy a ETH at some more high price.In trading,if you keeps on thinking means two thinks will surely happen.One is You are forced to buy at high price and Second is you can buy at very cheap price.Now the choice is yours.