| Ditto on wjb's advice. (If my daughter had it to do over again, I would strongly recommend the SAT I. She took the ACT twice, rocked both times, and took three SAT IIs and scored well on them, too. Never took the SAT I (PSAT National Merit Commended, would have been finalist?). Even with a straight-A GPA and 8 AP courses (including physics, calculus, econ, etc.) at a top, competitive high school and varied and exceptional ECs, her results weren't stellar. We have wondered if the lack of an SAT I was the problem.) Take SAT IIs first, get the scores, report the scores. Take the SAT I and if they are good then report them.
FYI: Some schools superscore the ACT, taking the best subscores from several testings, and recompute a composite. Take the ACT again if there was a weak subtest score. It can't hurt, you don't have to report it if it's not as strong as attempt 1. | 
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