Max Marksmanship + 3 from the rune + 1 from the head.
If you don't like the HP hit, you only 'need' 14 (12+1+1) Marksmanship to maximize BA's burning. Rez sig can be swapped out for Distracting Shot - unless you join a PuG.
[skill]Burning Arrow[/skill] [skill]Distracting Shot[/skill] [skill]Apply Poison[/skill] [skill]Throw Dirt[/skill] [skill]Whirling Defense[/skill] [skill]Troll Unguent[/skill] [skill]Rebirth[/skill] [skill]Signet of Capture[/skill]
replace sig of capture with something else if you like. i just always carry it with me in my travels cause i dont actively look up elites everytime i enter a new area.