Ethereum reached $167 on September 12 and that is when bitcoin reached $6100. Ethereum always follows the bitcoin footsteps and based on my observation, Ethereum gains bigger than Bitcoin but also losses its value bigger than ethereum. If BTC went down below $6000, I can say that ETH will go down from $130 to $150. Ethereum always pulling something on their sleeves so I am pretty sure that the price will recover soon and might reach an all time high by next year.
You just literally took these words from my fingers. Should BTC go lower than $6k, then expect ETH to respond accordingly with a lower low. Just like you, I'm setting aside some BTC to pick up a few good coins in anticipation of a bull run whenever it comes.