@2Hearts
Have you ever considered organic soil?
Its not terribly difficult to mix your own soil and its extremely satisfying knowing exactly what goes into it.
Mine is 1/3 sphagnum peat moss, 1/3 aeration bits, and 1/3 compost and earth worm castings. This is the base mix then you add amendments to the base mix and let it compost.
I've started seeds in the base mix no problem. What I usually do is fill a cup 2/3 with base mix and plug the seed onto it, it'll germinate and pop up in about 2 days. Once I see a first set formed, and 2nd set of leaves on its way, then I topdress the rest of the cup with amended soil mix. They only get a cc or two of water every so often till they're able to handle more... I've had great success with this method recently, and I enjoy the simplicity.