I'm gonna have to say that I don't recommend getting into aero until you do in fact have a nice source of rooted female clones.

What you will probably want to do is grow your from-seed plants in standard compost or hydro, take cuttings early to sex, save the most vigorous female of each strain for a mother, and then build or buy a bubble or aero type cloner that does not use a medium at all. The industry standard aero-cloner is the EZ-Clone, which uses no rooting medium, and the plants are suspended in midair secured by a re-usable neoprene collar that gently grips the stem and leaves the cut part hanging in reach of the sprayers. That way, you can put your cutting in ANY medium without fear of stem-rot from a bulky, wet plug.