Well I'll step in here and give you a couple suggestions.
Happy Frog soil is a good product and one of the few soils sold at grow shops that you can actually do seedlings in- it is MUCH lower in added nutrients than other high-end media.
Canna makes an extraordinary product line that includes a soil that I have not personally used, but have heard excellent reviews on, and I am a big fan of their fertilizers.

Then, if you are not feeling so spendy, you can go the cheap route and use something from the farmers' supply.
Bagged composted humus and bagged perlite, mixed 3:1 or 2:1 composterlite, is good but depending on the actual compost might be too 'hot' for young plants.
ProMix BX is a standard commercial potting soil and the trick to using it successfully is never plant your plants in a pot too big for them, and re-pot up to the next size once every 6 weeks. If you look at my donkey dick log, that's actually what I am doing with them.

If you are feeling cheap and there is no grow shop or farmers supply, even the big box stores sometimes have Miracle Gro organic choice. You have to add extra perlite to that, too, to make it more user-friendly but it works fine for plants more than 3 weeks old.

Enjoy!