the best decision is sitting on your arm-chair and dont spend it) cause of it's really high in price
Yes this is the best time to invest in the bitcoin, because the demand of bitcoin is rising with every minute and value of bitcoin is increasing as well. A think tank of united states who predicted in june 2017 that bitcoin will go as high as $25,000/- has predicted again that in first 3 months of 2018 bitcoin will touch $45,000/-. So if you havent invested in bitcoin so far, then you have already wasted a lot of time. Its better to invest ASAP.