noone mentions the KING OF SMACK?!?
Kalastar Tashalatora (Monk)/Ardent with Customize Mantle and Linked Power/Dominant Ideal is hard to beat.
Stacking size increases you get absurd base unarmed damage, which if you can get Weapon of the Vampire turns into amazing self-healing. Throw in Robilar's Gambit and you instantly heal from your counterattack when you take melee damage.
I listed a very similar build. No Rapidstrike, but Greater Flurry goodness.
you can even combine these two concepts...
for example:
dragonwrought kobold monk2/psywar11/slayer7
lvl/bab/feat
1/0/1: dragonwrought, monk: improved unarmed strike, monastic training (psywar)
2/1
3/1/3: tashalatora, psywar: practiced manifester
4/2/4: psywar: mantled warrior (freedom mantle)
5/3
6/4/6: multiattack
7/4/7: psywar: psicrystal affinity
8/5
9/6/9: improved multiattack
10/7/10: psywar: expanded knowledge (share pain)
11/8
12/9/12: track
13/9/13: psywar: expanded knowledge (metamorphosis)
14/10
15/11/15: rapidstrike (claws)
16/12
17/13
18/14/18: improved rapidstrike (claws)
19/15
20/16
needed: monk's belt, fanged ring, expansion, claws of the beast, bite of the wolf and dragon tail, vampiric claws, vigor
==> unarmed strikes 6d8 (16/16/16/11/6/1) + claws 12d6 (16/16/11/11/6/6/1/1) + bite (+16) + tail (+16)