I've only skimmed the surface of Roots and Embers. I keep meaning to dive into them completely, but time is limited and I get distracted easily. The two of them are both in Beyond if you wanted to take a play at them without feeling constricted to just what they offer. You could even drop in Astral Sorcery easy enough, and then you'd have all three to play with (in addition to Botania and Blood Magic).
I've not played with Astral Sorcery yet, but I've seen that it's in the Alpha Sprout pack, and I can't wait to play through that. Given that pack contains Ars Magica as well, I may try to play through the pack as a mage. Unfortunately, no time table has been set for it's release.