Yeah, it might be a good idea, depending on how "good" you want your four year college to be. A 3.2 in high school with an upward trend across the years and a 1700 SAT would still earn you admission to many four year colleges, but not many of the "best."
If you do choose the community college + transfer path, know the facts. Visit the transfer counseling office, and double-check that a large percentage of the students who attend there either complete their Associate's degree and/or transfer to a four-year college (preferably both). The more people following your same intended path, the better your chances.