I'd go for the peacebringer over the IFS. That 40 delay with RNG will drive you crazy if its your main weapon - even with FBSS haste.
I run the AC/SoS combo for DPS and for Tanking (More swings+proc=more aggro) and keep an IFS (lightweight) bagged for Damage Shield mobs.
Just my 2 cents as a 51 Monk
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