You're forgetting a very important one: Twin Strike. It does not have an ability modifier to damage. (But the two attacks more than make up for it.)
I can't think of any powers applicable for longbows that use modifiers other than Dex, but there may be some (either now or in the future).
Hope that helps!
Sure a fighter could use a longbow. But it's not good, because he can't use Combat Advantage or Combat Superiority on the newly marked targets with a ranged weapon.Something I just realized a moment ago--technically, fighters have a fair few close burst powers that could be used with a longbow (there's no "must be using a melee weapon" requirement), and in that case you'd actually use Strength. That's an edge case and a pretty clear violation of the intent of the power, though.
Sure a fighter could use a longbow. But it's not good, because he can't use Combat Advantage or Combat Superiority on the newly marked targets with a ranged weapon.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.