An update:
If the ranger takes “outsider” as a favored enemy, he ranger picks one of nine outsider subtypes as a favored enemy: either one of the four alignment types, one of the four elements, or "native."
Barkskin now grants an enhancement bonus to a creature's natural armor bonus, in the same way that magic armor grants an enhancement bonus to the armor's armor bonus. This means it *stacks* with a creature's existing natural armor, making it a great spell for the druid's animal companion. The progression is +2 at 3rd, +3 at 6th, +4 at 9th, and +5 at 12th and above. In general, magic effects that increase natural armor should all be read as adding an enhancement bonus to natural armor (most, if not all, state this clearly). Thus, barkskin wouldn't stack with the amulet. The only "source" for actual natural armor is to get it as a racial feature of your creature "kind."
Resurrection has a 10000 gp component; Raise Dead a 5000 gp component.
pp. Tenser's transformation in 3.5 simply grants the character a BAB equal to her character level, regardless of the class levels she might have. It also grants +4 enhancement to Str, Dex, and Con, +4 natural armor bonus, +5 competence bonus on Fort saves, and proficiency with all simple and martial weapons.
Observation: Barkskin becomes the Greater Magic Weapon of Armor buff spells.