1, 10 and 11. Nice designs
Again as said (and said well) all depends on your clientbase. 1 very corporate, will make you look larger than you are.
10 and 11 are more (11 is much better though) does give off a structural building design'ee type feel too it. Think about your typography, audience, current clients, were you (they) want to move your (their) business. It really should not take half this bloody forum to tell you this matey but there you have it...it has to be said. - all about the input!
Otherwise as above...nice.
Good luck!
P.S Didn't you post some site designs for the same company? If so should the cards be in line more so with the final design of the site? Get the continuity going...
