There's actually 2 decent bows, depends what you choose:
Crystal Bow - Requires: 70 Ranged + 50 Agility + Roving Elves Quest Completion
Dark Bow - Requires: 60 Ranged
Details about the weapons:
-Crystal Bow-
This rather nice bow surprisingly requires absolutely no arrows but relys on charges and when all charges run out it req. 950k ( decreases to 700k, 550k, 300k, 150k over time and stays at 150k ) to recharge it, it is quite powerful but every time it degrades the bow gets weaker and looses accuracy, a slighty better choice than it's counter part Crystal Shield.
-Dark Bow-
Thos rather unique bow unlike others fires 2 arrows at a time, using normal arrows w/ special attack makes sure you hit a double 5 minimum on your target, you may get lucky and hit higher, however if it power you want, this is the bow for you, get dragon arrows w/ special attack for full on ownage, the bow of choice for minigames like castle wars, duel arena, bounty hunter, pvp, clan wars and much other pvp stuff, for a once time proce of around 800-900k odd in grand exchange works out millions more cheaper than a crystal bow but the bad side is it can be very arrow draining.
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The highest hitting bow with the highest DPS in runescape is the Zaryte bow. The bow with the best special attack however, is the dark bow with dragon arrows.
The best bow for non members on runescape i think is the maple short bow it is short so it is really fast and its a maple so it is strong as well
Crystal bow (fully charged) , Dark bow , Rune C Bow, Chaotic C bow, Magic longbow (sighted), seercul bow .
Look for the bow emote.
Nothing realy just that short bow is stronger but dosent shoot as far as a long bow.