hmm good question. On my 55 gal reef tank that crashed on me about 2 months ago I added the uncured live rock in with the existing live sand (not the cause of the crash). This was done after the crash. I had moved the live rock that was in it to another tank. Well my tank cycled again and when I had enough money to buy another batch of live rock I had to cycle the tank again. Which is why the setup of my tank is tanking so long.
If you truely have live sand and are going to be purchasing uncured live rock then my suggestion to you is to have the live sand in the tank and get yourself some rubbermaid tubs and use an extra pump and an extra cheapy light and put the uncured live rock into it. As long as you have circulation and light then you will be able to cure the live rock.
If you are buying the "live sand" and live rock at the same time then I prob would just place everything in at the same time. As you "live sand" in a bag will also cycle.
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Photo anyone? 
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