I'd roll with BOAx2 weapons over SFx2 for monk.
You're gaining a huge amount of stats by pairing 2 boas. You're gaining haste, crit, and stamina at the loss of only a few agility and a shadow bolt proc. It makes more sense to have more stamina on a monk (seeing as how you can't get around WSG while in stealth) you're going to take more damage and every little bit can add up to help you get back in range of your healers before you're dropped. Imo, monks already do more than enough damage so I'd rather have more stam, crit, and haste than just pure AP anyways.
But I mean, if you're able to do so, you just GOTTA have that SFx2 mog on a monk!