Well, as far as I know, US colleges tend to not care quite so much about your final IB scores as they do classes and grades. It's like with the AP tests, your final score could get you credit for a class, but since they don't receive them until AFTER they've accepted/rejected you, it won't make too much of a difference to your acceptance. Of course, they might rescind if you fail or do terribly, but I doubt they'd rescind for a good score that's not quite as high as a 42.
As for what classes they prefer to see, US colleges do not give credit for standard level classes, and I think they see them as below AP, which really just shows a basic misunderstanding of how IB works. But as far as picking the actual classes go, it's basically the same as AP. History or economics would be a better choice than geography, and so on. When picking HL and SL classes, I recommend choosing the ones that pertain to your major as HL. That way, if you get a good score on the exam, you might get credit for it and get a requirement out of the way!