I like that #2 & #9 incorporate a unique design logo within the company lettering and incorporate the steel grey and orange. In addition the subtle graphic should also be able to be used outside of the company name as a stand alone logo that will be instantly associated with the company. Both are on the right track with the second "A" in TITAN. A good place to see what I mean is IMG. www.imgworld.com I really like the "M".
Your color scheme is the best. I would only like to see the orange more vibrant. Even a bright pastel.