The Narga weapons are pretty uber, considering how easy they are to get.
The Diablos Chaos Broker hammer and the Diablos Greatsword (dunno the name) both got upgrades, and they're still holding their own.
Copper Blangonga stuff is really strong, too; Copper Blango Decimator is the best raw LS in the game, Magnitude is one of the best raw Hammers in the game, and the best raw SnS (lol) is the Master Binding Blade or Great Kukri or whatever the hell it's called. All from Copper Blango mats --- HR9, 180 hours! ---- Gold Soul Z Brunhild/Juggernaut/Midnight Blades/Golden Falchion/AncientDrgnwoodCannon!
ye i have all the narga weapons i also have most weapons but i heard somewhere that there is a relly powerful bow called 'tirants wrack' i read it on the internet but im searchin for the most powerful weapons