It depends on how much prep you will need. You could also do the November date or even the December date if you are applying for many of the schools with the New Year Deadline. Many other top schools have Feb deadlines and many state schools have rolling deadlines (though complicated, tell me if you are applying to any state universities)
sparknotes.com has prep for the Math and Science tests and the US History one. Barron books are good, even if overkill.
lol, why did I have to look up SAT dates twice in the last 10 minutes for TSR?