I think I'm selling mine when they go under 400$, which I hope will never happen, but might even happen today the way it's going down now.
On the other side I think I will sell them at around 900$
I sell btc when I need money
it's easy no stress and when I do a change it means I need the cash

I don't do you're way because once i sold all my bitcoin's to get something expensive and the suddenly,there
was a spike on btc for about 100$... i would earn so many,so i always convert them when i seriously need something to buyy.
I had similar experience. I bought some graphics cards early this year, at price of around $400. That made the cards very expensive now.