Save the money on the live sand and get the dry stuff and place it in your tank. Once you have the tank set up ask a few different folks on here for a cup of their sand to seed yours. That is the best way and you get a diverse group of different life forms that way. I know I'd be willing to give up a cup when you're ready.

BTW, those Red Sea tanks are really cool. I saw one up and running and really like the concept of that one more than any other all in ones I've seen. That would be a great way to cure your rock by just setting it up in the tank since you have the skimmer built in to help keep it all clean. Do your water changes regularly and in no time your rock will be cured and your tank will be cycled at the same time.