I am in the final stages of setting up my planted tank.
After reading various threads on here I decided to use just over an inch of Daltons aquatic mix on the bottom and a similar amount of Daltons propagating sand on top of it. You will definately need something on top of the Aquatic mix as it is essentially just clay!
I would love to tell you how mine is going, but as I said, I have only just set it up - don't even have it fully filled as I need to get a brace replaced!
If it helps, I got my Aquatic mix from Mitre 10 Mega and the propagating sand from Palmers plant place thingie