Thanks for sharing your experiences!
I think I'm going to go with Black Diamond blasting grit and some Pfertz root tabs. That combo will cost half as much as Tahitian Moon Sand + root tabs or eco-complete + root tabs. And since I can always keep using root tabs, it won't set me back that far if I want to upgrade the substrate down the road.
What size grit of blasting sand should I get? 20/40 or 30/60?