*checks in*
Great info. DiP can herd sheep with the best too!

I vote for Bow 2.

As to your questions on which is best, it really depends on what class of monster you PvE. If you are doing middle monsters (regular ones), then slayer is the way to go.
If you are doing peerless, then you can usually get by without a slayer as long as you honor the opponent and hit alot (and have over 50 bushido). The honor bonus will equal the slayer bonus at step 20.