#4, I like the concept - the image of an H that incorporates a G as well, but... it doesn't quite do it for me, maybe thicker stokes, not quite sure... does it need to be symetrical to flow well?
#5, I like the over all design -- image postioning, text positioning; but that image doesn't seem to work
#6, I like the concept, the font choice seems to not standout -- maybe too thin