I agree that it would be best to wait. CO will have a summer BF sale (I say that because I dont see a reason for them not to as of now). The tickets to BCN will roughly be around $2,000 which would be the best bet for you. As you would be confirmed and get 150%eqm and not spend the miles.

Keep an eye out in late feb or early march for the R-fares to be released. You have time I would not rush. and if it comes down to April then opt for the H fare.

BCN is a great city, one of my favorites in Spain. I hope you enjoy your trip. And I hope you go in style