I've got PFS in both of my tanks, around $10 for a 50lb. Bag at Menards... Never had a cloudiness issue, but washed it well before adding it, put it in before water, and when I added water I set a plate on top of the sand to avoid stirring it up.
My 29 gallon has PFS on top of topsoil and never had any problems with it either, and it's only got about one inch of sand on top of the topsoil.
Even when some gets stirred up during a water change if I dump in too fast (I use buckets for water changes on my small tank) I never seem to have a clouding issue.
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