I'm sure most here would disagree with me, but I say reuse your old sand. I would rinse in "used" salt water (stored from a water change). You don't want to kill the "life", just rinse out the detritus. I did that years ago, when I set up my downstairs tank, and the cycle just continued with no ammonia or nitrite appearing. You will get some cloudiness, but a bit of MB7 clears that up pretty fast.
Personally, I think (again contrary to popular opinion) new sand is more risky. There is no "life" in it, and may even contain dead organics which could cause a cycle. And will take some time before it can grow enough life to "digest" detritus.
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