Elf Cleric 9
The big thing is that you can cast Greater Magic Weapon on both the weapon and the arrows. Take Quicken Spell as a feat, and Quicken Divine Favor, and you get +9 / +9 to hit / damage total, with the GMWs. With empowered STR you'll get some +3 / +4 to damage with Bow of Might so...
You'll get 1d8 + 14 damage if STR 18 and point blank shot, plus the above spells. Most of the time you'll only have +11 though, because the Divine Favor is short duration.
To-hit total bonus will approach 20, depending on Dex and boosting spells.
Good feats are Rapid shot, Point blank, quicken and maybe empower.
PS, I'm playing this kind of character now, and it rocks! My DM doesn't allow the stacking of arrows and weapon plusses, but thats only his houserule, the above is all legal, and without magic items.
Edit: it must be human, ok. Still workable, just spend the extra feat on martial weapon proficiency, if you don't find a deity with suitable favored weapon.