Sub recommends that you do not use a soilless mix because it won't have enough juice to make it through the whole grow. I'd go with one of the ones that Sub suggests he notes his insights on the different types of base soils in his SS recipe post. If you do not have access to a Roots Organic, Happy Frog, etc. then I would go with Kellogg, but if you do, I'd just stick with what's suggested.