I really like the look of #7 The idea of M & A combining is great but I want to see it more noticeably...perhaps make the color contrast different or the size of the letters different? You could stay with the blue and silver and make it stand out via the color hue, or perhaps try gold and black, or gold and marblized dark gray? Just a few ideas... I like the idea of forming a "double helix" from the letters...