If you'd like more weapon options with Metallurgy try Tinkers Construct it adds several new varieties of weapons that are highly customizable. If you plan on using them together you'll need the mod Extra Tic to provide cross compatibility. Many of the metals have special properties that work very well with Tinkers tools and weapons giving them effects such as poison, wither, life steal, flame, ect.
Metallurgy 4 is probably the biggest for raw ores. If you want super diverse tools, Ramblinman817 has it pretty good with Tinkers Construct with Extra Tic. I believe Extra Utilities also adds in some more stuff for Tinker's with its materials.