Of course before the new year because most of the time the price of them are cheaper compared when the date is after the new year because maybe just maybe the same thing will happen again just like what happen last year when the bitcoins and almost all the successful altcoins rise up when the december comes and before the year ends the price are slowly going down again and then if that is the basis then it is great to buy after the year but you already loses the chance and you will wait again for another year instead of just a few months.