Just one opinion, so I'd be interested to see what others have to say, too, but I know that I've seen quite a few schools have prerequisites of at least one semester of calculus, so if you need to fulfill that requirement I'd recommend taking some calculus.
While many schools don't explicitly require calculus, they often want to see it, and as an example Yale even has an "opt out" policy of either a very high quant GMAT or a calculus background, or you'll be required to take a "Math Boot Camp". Because schools do have a strong preference, if not requirement, for a working knowledge of calculus, I'd recommend taking care of that while you can!
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