I use just regular old potting soil, 4$ for a huge ass bag at kmart, i just add molasses, perlite, and my veg nutes to it about a week before i plant a seed in it, i always put the molasses and veg nutes mix around the area i plant the seed so i dont burn it, but yeah i've had decent success with my soil, now all i gotta go is switch from my 90w ufo to a 400w hps which i'm doin as soon as i get it in the mail...