| Dexion1619 |
I like Mountain Domain myself. Foot-Hold, while not great, has some interesting uses. Thin Air is a great ability, You're domain spells are nice, Stone Fist lets you ignore hardness less then 8 (so you can smash anything made of wood with ease), and you're 4th level domain spell is Stone Skin.
Other then that, Plant is a strong option, for all the reasons above.