I have the same dilemma though I want to buy something at a certain date but I don't know if bitcoin market price will be in my favor when the time comes. Majority here highly suggested that you have to sell right now rather than to wait, and then sell. Looks like I have to do it either but I have this little feeling of bitcoin would soar by a bit may be at the last week of December. May be we should wait man? Either way it won't be a big loss, I supposed.
When are you hoping to buy it by? If it's before February I might advise buying now or waiting but with a stop for if the price goes below a certain amount (if you have enough btc that it doesn't really matter).
I managed to make a strategic buy last year and got something when btc was at $14k and its a great feeling to call closer to the top but we're not going to get back there for a few months imo.