I have to agree with not worrying about acquiring "after Army" skills. I did my 6 years as a 12B, talk about ZERO civilian skills. No job skills to use in civilian life, but I did very much enjoy my job. And no matter what you do in the Army, if you apply yourself you will develop life skills that you will carry on no matter what you decide to do after you get out. Since I got out I have been a furniture assembler, printer, ran a machine that made napkins, worked in a paper mill, and now I am an journeyman electrician. The things I learned in the Army have helped me in all of those jobs. Skills like never giving up, always being on time, not looking like a "shit bag", etc...
But with all that being said, I think that of the MOSs that you listed, I would go with the Cav Scout.