It's a little late to catch the newest dip of ETH/BTC but it's not a bad time to buy. You'll probably see the price dip again but not as severe giving credence to the flag pattern forming on a very nice Fibonacci retracement.
Keep in mind the fundamentals and news that's happening around this pair. Segwit. Soft Fork. Adoption everywhere. Owning both at sub $400 and $2800 respectively is going to be a fun ride.