I think that it is absolutely possible to say that it's a good time now to do that, especially if you buy it with cash. Market is at the very low point now and in future ETHs price may grow greatly.
For the last week, the price of Gaza showed another maximum of more than $ 3. Of course, this is a very promising indicator for the etherium. I think that in the near future the etherium will take new positions among the crypto currency.
We cannot say and speculate exactly about further fall. We can also have a rise in the values instead. Having said that, I would not wait and will invest right away in ETH. Because this investment will have low cost that an investment made at high price, it will increase my profit margin when the market will be in full swing. The lower the cost of investment, the higher should be the scale of investment given future returns.