Personally, I go for the simplest and most effective. 1 part peat, 1 part perlite, 1 part balanced compost, and some Dolomite. Keep some 4-4-4 and some 2-5-3 both on hand for topdressing!
Though I must admit these sativas need something more along the lines of 0-20-11 for topdressing (2 part...