Low light plants should do fine under high light, but they still will grow somewhat slowly!
If you have seen pictures of Buck's tank, I would go witht he flourite and sand. The sand encourages strong roots and looks great too! Or you could go with flourite and the Tahitian Moon Sand.... This is black sand and I should be getting some to add to my tank in a week or so, I'll have to post pics...
Tank in transition! 55 gallons, hard water.