I guess it's hard to pick a level to stop SoulKnife progression because every level gives (or will cost) you something.
To answer the question about weaknesses of a All out SoulKnife, I feel that it would be Weak against:
a)Heavy Magic users (no special defenses... just saves
)
b)Undead+Constructs (can't use psychic strike)
Have you guys taken a look at the PrC in CW called OccultSlayer? It is of my opinon that EVERY melee class should get at least 2 levels of this, the +1 to all saves, extra damage to creatures that use magic/magic-like-abilities (pretty much everyone at high levels) and Spell Turning 1/day is key. (this would take care of weakness "a" and then some...
)
I have no idea how to handle weakness "b".
Also, I took a look at Vow or Poverty, it does give AC bonus (+4 at lev1, +1 every 2 levels thereafter). It also give a ton of other neat abilites. It definatly a good idea.
But Vow of poverty needs you to have 2 feats to pull off, (some pre-req feat + the vow itself). Assuming your not Human, you will need to use a "bonus feat" class in your first 2 levels to get it quickly... any ideas?
Thanks!
-Zipher
To answer the question about weaknesses of a All out SoulKnife, I feel that it would be Weak against:
a)Heavy Magic users (no special defenses... just saves

b)Undead+Constructs (can't use psychic strike)
Have you guys taken a look at the PrC in CW called OccultSlayer? It is of my opinon that EVERY melee class should get at least 2 levels of this, the +1 to all saves, extra damage to creatures that use magic/magic-like-abilities (pretty much everyone at high levels) and Spell Turning 1/day is key. (this would take care of weakness "a" and then some...

I have no idea how to handle weakness "b".

Also, I took a look at Vow or Poverty, it does give AC bonus (+4 at lev1, +1 every 2 levels thereafter). It also give a ton of other neat abilites. It definatly a good idea.

But Vow of poverty needs you to have 2 feats to pull off, (some pre-req feat + the vow itself). Assuming your not Human, you will need to use a "bonus feat" class in your first 2 levels to get it quickly... any ideas?

Thanks!
-Zipher