Sounds tasty...I crossed BM with WW. The babies are tiny, but a few freinds are growing them out too. I used one WW male and my favorite BM fem as a clone...I was well familiar with her traits. I kept the male, but what happens next only time will tell....playing by ear.
If I had the room, I would clone all the moms and dads and cross them individually...some say the only way to properly pick a male, is to examine his progeny....but of course, this could be a mess in a closet.
Do you have particular traits in mind? Or is this your first grow of these strains? If you have grown them out, was there a lot of variance? I only popped one BM the first time, but I'm hoping the scond one I just popped is a male. I got ten phenos out of ten WW, so...I'm guessing they are F2's.
Give me a few more details on your intentions and I might be able to give a little advice or a few good links. Are you devoted to stabilizing?...or just having fun (like myself)? Since you mentioned backcrossing, I expect you will be keeping the males (or one)....throw some numbers at me and pehaps we can come up with a plan (if you want)....how many fems and males of each you have and stuff. I'm not pretending to have breeding figured out, but perhaps we can put our stoner heads together.
I am still far too busy trying many strains looking for the smoke I like to take on a 'stabilization', but I pollenate nearly everyone...just for fun (or in case).