They're all random drop, so follow dps. The lvl 19 variants do the most damage and then higher the qua the better the item. Only ranged weapon with stats is a dex + 2 bow but it's dps isn't great.

If planning to use (x)bows/slings then dam+ gear and killrin agility set is way to go. Also note that wc is an obsolete stat as all projectiles have 100% accuracy except against reflect missiles

I'm afraid not although it would be nice if something like that was added