Originally Posted by
jsaving
I've capped two monk-splashed druids thus far and see this kind of build as a mixed bag. The extra feats from a monk splash give you much-needed flexibility, evasion is quite helpful at the beginning of the game and remains moderately useful on normal difficulty even at cap, and water stance gives you a slightly higher DC than pure druids can achieve. Stunning fist on a wisdom-based druid is helpful as well, although the presence of another low-cost tactical move (takedown) combined with the temporary spell points you'll frequently gain through essence of the shrike make SF less of a must-have than it is on a cleric.
But there are some negatives as well. The monk's wisdom bonus to AC isn't enough to offset the defensive benefits he'd gain from wearing armor. You lose a slot (off-hand), as you mentioned. Your animal-form damage will be set to 1d6 even in dire/winter form, reducing your melee DPS. You forever surrender the big reduction in cooldown times you would have received with the capstone. And you run a real risk of "buyer's remorse" down the road as the devs release more 9th level spells than you're able to feasibly memorize.
One option you didn't mention is to splash monk but wear armor (and use a shield) anyway. You lose SF and your stances, but gain your off-hand slot and decent damage mitigation. Contrary to what some believe, you also retain access to evasion as long as you don't go beyond light armor. This wouldn't generally be worth doing on a clonk because SF is such a key component of that kind of build, but because you have other low-cost wisdom-based tactics options like takedown, it can be a viable and even desirable approach on a monk-splashed druid.
As to how many monk levels to splash, I think the "healing curse" isn't especially useful on a class that frequently gains temporary SP (essence of the shrike), so you'd only want to consider a 3-level splash if you expect to be the only party member capable of doing finishing moves, and find them necessary for your playstyle under those circumstances.