The best price to buy ETH is from 280-300$. And now ETH is still in this zone, this is a good time to buy ETH and hold.The price of ETH has been heavily influenced by the ICO hopefully you can see the ETH price above 1000$ as early as 2018
I also expect the price of $ 1000 at least. I hope that the price of $ 280 is temporary and because the market is crypto-currency at the bottom.