Mine is: Non mineralized topsoil, then a THIN layer of play sand, then Eco Complete over both. I have not had much problem with silt making its way up. I DID have some initial problems with the topsoil not settling down, but eventually it came clear (two or three days). Check my journal linked below to see what I did.
HOWEVER: Watch the depth of the substrate...NON MTS, plus too much substrate equals gas bubbles, which I have a lot of, now. I have to skewer the substrate every couple of days to release it.
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Link to my first planted tank, 37 gallon tall, topsoil, sand, Eco Complete