Elven 12 Ranger 6 Monk:
31 points to get Crit in AA,
21 points to get crit in DWS,
14 points to get the Elven AA tree (so you don't need 18 Ranger for the AA Core Crit)
I was comparing by classic monkcher (12M/6R/2P) with the above for losses/gains

dropping from 12 to 6 monk the main losses are; (need 12 ranger for crit range in DWS)
* Abundant Step
* Improved Evasion
* and some extra run speed

6 monk still gets you;
* 3 extra martial feats at 1, 2, 6 (lets you grab precision, 10k stars and master of forms)
* Still twist dance of flowers for +1.5W
* mountain stance for +2/3 con, +12/15%AC, +12/15 PRR and +1 crit multi on a 19,20 depending on master/grandmaster of forms

Doesn't the mountain stance crit stack? So dropping 6 monkey levels for me +1 extra threat and 1 extra crit? I need coffee.