Great thoughts! I like the overall direction of #3, but I think it may be a touch too aggressive. Perhaps it could be softened a bit, and made a bit more upscale? Maybe introduce a touch of color for contrast.
OD, I like the introduction of the blue in #4, but still feel all examples #3, #4, #5, and #6 might be a little to "heavy". I'd like to see something a bit more refined and upscale. I'm not crazy about the colors in #6.