With FB enabled, take a hard look at Primeval.
Neanderthal Bar8/Prim10/Warshaper2
I like Dire Ape as my Primeval Form, since it retains a humanoid shape and gives you rend if both claws hit (+50/+50 for d8+31 + rend 2d8+62; Bite +48 d8+15)
Endurance, Self Sufficient, Improved Toughness...