Let's see. Manifest Claws of the Beast using 19pp for 5d6 damage, take Rapid Strike, manifest Inertial Armor.
Benefit: You can make three 5d6 attacks per round with some extra AC.
vs
Dip Monk, spend a feat slot on Tashalatora instead of Rapid Strike.
Benefit: Well you gain a... Pathfinder? You mean Greater Furry & 20 BAB? IE six attacks per round?
Are you aiming to stack clear up? 1d10 turns to 2d8, Monk caps at 2d10 so adding Eberron's Augment Crystal means 5d8 damage right?
Are we talking about factoring bonus damage too? I mean, graft on some Stone Spikes and suddenly we're talking +6d4 damage for 4,000gp.
Simple fact, Tashalatora deals more damage, has better AC, and probably has a bit better boost in skills.
It does cost a manifester level though...