I like #42. Good combination of the letters. #43 I think looks slightly too complex or something. I like the idea, but something about it just doesn't appeal to me nearly as much as #42. #41 has a bit too much of a "phallic" look to it.
Since we are in the final phase now, do you have any more changes you want to suggest? From the finalists I would like to see both a white background and dark background version for both the full logo with the company name and the "icon" version. Could you please supply those versions based on #42?
#42 - full logo white background full logo dark background icon white background icon dark background