I like #4 but have to see it with the subbranches added as stated in my general comments to the contest. The logo has to work both with and without the subbranch. It would also be interesting to see it in "negative colours" with text and "smoke" in white.
Dear Gray Source. Your version #31 and #32 is two out of three left in the competition and I will select one out of these three. Could you just give me a version of both #31 and #32 where the two words White and Smoke is diviede as two word little more clear? The space between them should not me much but just as they acctualy are two words.