I've got a dex-based halfing monk stunner/dark that I'm fleshing the trees out and was thinking the following looks pretty good to me. Goal is to maximize stun first, then ability to do damage.
Halfling Luck I II III
Halfling Dex I II
Guile I II
Riddle of Fire
Static Charge (this could really be any elemental attack, but boosting elec damage works pretty well at end game so far)
Mystic Training I II III
Way of Tortoise
Ability +1 (Wisdom I)
Ninjustu I II III IV
Touch of Death
Sneak Attack Training I II III IV
Fist of Iron
No Mercy I II
Wisdom I II
Acrobatic I II III
Bastion of Purity
Protection from Tainted Creatures
Deft Strikes I II III
Smite Tainted Creatures
Conditioning I II III
Wisdom I II
Coming into this I've got 51 Wis/34 Dex, so end up at 56 Wis/36 Dex with a Stunning Fist of 69 (including Yugo/Ship buffs).
Some outstanding questions I have:
1. Does No Mercy stack w/ FoTW Sense Weakness?
2. I give up 10% on the final No Mercy or Shadow Double tier to take the Guile II for the extra SA die. Not sure if that's worth it.
I think my dark monk, which didn't make the prereq's for Ninja Spy under the old system because it's a first lifer, but could stun anything stunnable in EE, comes out way better w/ the enhancement trees, gaining 5-6 SA dies, plus cold iron/byshek/silver DR, and still sits at the top of the first life stunner pile. Or maybe I'm just seeing things wrong.