smart move to play the market. many people see this drop as something bad while you can use this price drop to buy more at lower prices. what seems to be not so good, turns out to be a great opportunity.
i agree with magicmexican ^ there is nothing wrong with just holding if you have planned well enough in the past. for instance if you have bought when the price was stable and low at ~$200 then you have nothing to worry about and you will earn profit in the future.
selling in these bumps is only good for people who are trading on daily basis and have coins at the ready to risk with each price change.
holding is indeed the best option. i have been holding all my coins as well. i just used the price drop in my advantage to buy myself some more coins. and these coins will also be kept for the long term.
Hold most of my coins. As I mine, so I have constant flow of new coins, I use some of them and hold the rest.