PC on zealous shadow longbow of marksmanship

Hi all, how much is this worth?

Zealous Shadow Bow of Marksmanship
piercing dmg 15-28 (req9)
Damage +15% (while health ^50%)
Energy gain on hit +1
Energy regen -1
Marksmanship +1 (20%chance while using skills)

thanks in advance

25k-ish. nice zealous mod though.

Thanks