Yeah IBL strains are great, especially the F1 sativa\indica hybrids you make of IBL's acclimatized in the same climate.
I've legit seen some 3,5 metre Leb27S x Royal Dane phenos at around 58N.
But at your latitude you won't have a problem with even the mainstream seedbanks early offerings, figure you could even pull off Serious6 from Serious Seeds, and that is quality stuff with parts Freezeland in the mix (pink pistils give it away).