You'd not be going for unarmed attack, but rather the kama duel-wield. This grants you two extra attacks, as does the haste. The difference between 6 and 9 attacks per round is quite significant, and also allows you to make far more of the first level Truestrike spell. Coupled with the Keen Edge spell, you are about three times as likely to score a devestating critical.
I don't think a high spell resistance is essential in this kinf of monk build, as the arcane casting classes suffer low fortitude saves and AC. With high speed, improved knockdown and devestating criticals, most mages will not have the time to dish out much damage. If you expect to face them without active Truesight, you may even use your own invisibility or invest points in the two Stealth skills to cover the distance unseen.
The one exception is when fighting a player who knows what he/she is doing (i.e. is familiar with spells other than IGMS and the Bigby series), in which case a high spell resistance won't save you either.
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