I really like the Pukani rock that BRS sells. It is very light and porous. If you can swing the extra cost I really think you will be happier than with their base rock. I would use live sand since the cost between live and dry is really not much. I would add some critters(crabs) to the biocube to let them eat and produce waste to add to your biological load and to give you something to watch.This is probably a no-no (no flames necessary) but I have used many snowflake eels to cycle a tank and have never had one suffer any ill effects from the cycle
I have to honestly say the only time I ever got pests from live rock was when it did come from someone's tank. Think about it, when a tank is broken down usually it's because the person who was running it was having a problem with hair algae, aiptasia, phosphates, nudibrach's, red bugs or a host of other pests. For me it will always be dead rock or new live rock that was not in anyone's tank.
Hope I haven't added to the confusion lol
Have fun