when i started, i used
fox farms light warrior
fox farms ocean forest
perlite
when i finish this last bag of ocean forest, i intend to go and get some Scott's soilless mix
if scott's doesn't make that, then i'll get some potting soil
i'm becoming an even bigger dick than i already was though since i've been reading fdd, ub, riddle, and a handful of others who seem to sound like they might actually grow something...
i say - spend less on medium and more on whatever you ACTUALLY need (lights, circulation, and a SEALED area)