There are a couple of really good human ones, but they are Powergamer tactics.
If you are a human monk, take your first level as Sorcerer to get the armour and true strike spells, then begin your monk levels, as a human you take can ignore you highest level when working out the experience point penalty.
Also if you are playing a mage, having one level in monk is also a good choice, for the AC bonuses and fighting skills.
This can work for other races but you suffer a 20% exp penalty (Don't know if they are putting this rule in NWN)