As has been mentioned, there are really only 3 weapons to use as a Dex-based monk: Staff of Nat Gann, Breeze and Epic Staff of Nat Gan, and there are plenty of places where those will plain suck, even before acknowledging that they attack slower than handwraps, aren't getting the benefits of Power Attack and don't give you Dex and a half to damage.

You could easily drop that 18 Wis to a 16 and spend those 6 build points on Str, giving you a 12, which is enough to pick up PA with a +1 tome and to give you a better buffer against becoming cripplingly enfeebled. Speaking of which, not only does Ray of Enfeeblement start to come up in Harbor quests with some frequency (and is a huge pain in Irestone, for example), but there are also poisons. Maybe you are the sort to wear a PAP item full time in any content where you may get poisoned, but I prefer using a pot to losing an equipment slot, even in the low levels. I've had characters go helpless with more strength and less equipment in several low level quests (Red Fang jumps out as one) due to poison-based Str damage.

There's just no reason to dump Str that much on a monk. What are you getting for that 18 Wis? +1 AC? Not worth 3 more damage per swing, access to Power Attack and further protection from enfeebling effects.