Its always gonna be better to use the bamboo spear if you are going agi anyway, slows you less and you get that overhead for when all your weak ass teammates die and you have to kill the last 7 guys yourself.
Nobody expects the bamboo spear overhead the first time, and you can swing it surprisingly fast with an agi build. It's a great support weapon. And you can use it with your buckler to be the dumbest looking hoplite.
Oh and to answer the thread question: I like 18/27. Enough PS not to glance, but still an agi build.