Before you are thinking about selling, think twice. Bitcoin can pump insanely high since the marketcap is really small and it can potentially go to 100.000+ per coin long term, so 600 to 1000 is absolutely nothing.
The next months will be fun.
Well, it seems promising if we look at the past data, according to the currently price that keeps fluctuate within $690-740, all we have to do is to be patiently waiting. It's not impossible of course to reach $1K, but a bit increase influence people to sell their coins and it will make the price decrease again.