the bow refire-speed doesn't really matter when you're spiking, since it will be overridden by the cast-time of the skills anyways. So for example, when you use Punishing Shot, no matter wot kind of bow you use, you'll get the shot off in 1/2 of a second (unless you're hexed with some sort of slow).
Like someone mentioned earlier, 5/1 vampric hornbow with a sundering longbow as switch-off(to prevent constant health degen) is the way to go as a spike ranger.
As for precision shot, it has no casting time, which means how long it takes depends on your bow. However, Dual shot > Precision shot when it comes spiking, in both 8v8 and 4v4(at least imo).
You get Exp 14 and Marks 16 with 2 superior runes, and leaving WS at somewhere around 6+1 iirc.
And finally, to choose between punishing/quick shot, I go with quickshot if you're more dmg-oriented than interrupt-oriented. With quickshot, you can chain Dual->Quick->Savage->pause->Quick. With punishing, you can only go Dual->Punish->pause->Savage->pause. Not to mention Quickshot has always been there for me when I need that one last hit to finish off a caster before they run out of range.
