Look here the deal. Nobody knows your costs and nobody knows what the price of bitcoin will be when the cost is due. What do we know? We do know the current trend is down, so the probability is that prices will continue down for some time with some rallies in between. It will not be straight down. So ask yourself how would you feel if you waited and prices were lower, how would you feel if they were higher. What is the most responsible and reasonable approach? That is up to you it is your money. But do not make your decision from hope or fear just reason.