for white widow i'd go with the og's, mr nice, now called black widow though.. shanti, one of the breeders at mr nice was the one who breed it back in the 90s when it won all of it's cannabis cups while he was with greenhouse seeds still.. he has since left and went over to mr nice and took all of his genetics with him in the move..
for northern lights i'd go with sensi seeds and they have been in the game much longer than most other breeders put together.. they are another og company that has some very old school genetics worthy of growing out again and again.. just finished a grow of their mr nice strain, aka, g13 x hp, and it's some lovely stuffs..
not sure on ice though..
some of the breeders i like over there are bodhi, cannaventure, karma genetics, dna / reserva preveda, a lot of people like subcool / tga, delta 9 have some nice stuffs, a lot of people have good luck with g13 labs and so have i.. soma has some nice gear as well.. also mr nice and sensi like i've already mentioned..