I may have said this before and sorry if this is repetitive but I just want to put my .02 in, maybe it will help someone. I'll start by saying I do not own or mine any cryptocurrency. I did work on Wall Street for 20 + years and from 95 until 2013 traded equities for a living. Way back my first boss said something to me that was pretty simple but a lot of people do not do it when investing/trading. He said "the market is the only place in the world where, when things are on sale, no one wants them." Again, I do not invest or trade any crypto more due to the lack of time with my new business but evaluate the situation. Learn about reading charts and understanding technical analysis if you're going to do this seriously. Then apply it to the situation.
Furthermore, I did do a quick look at the candle charts on BTC. Taking into account it's meteoric rise in 2017 it is likely it will be pretty volatile for a while. Looking at the chart quickly BTC specifically looks like it may have some support around the 7500-7800 level. This does not mean it will definitely pull back to there, it may just hang around the 10k level because it's like a magic number in traders eyes. I also did not do any real technical analysis so take that with a grain of salt.
I will also say a good friend of mine who made a lot of money trading and is currently retired, has been watching a few of the coins. I spoke to him last week and he said the stars were starting to align. Meaning he was starting to see buying signs with his analysis and he was starting to buy a few of them. I've traded with this guy before and if he's doing like he did in the past, he'll be buying big. This does not mean he will be 100% correct but I've seen this guy make some pretty bold moves in the past and he usually makes out well.
Just thought I'd put that out there, again, maybe it will help someone.