Cutlass.
Manny blade and hilt and rod. Full lapis and a metric fuckton of quartz. Can toss on moss if you are concerned about it, but should last a hell of a long time, full manny durability is crazed. Cutlass takes some durability modifier from hilt, unlike the other swords in case you are wondering why. Even without adding additional modifiers, you are at 12.5 hearts a whack. Factor in the 10% crit bonus of cutlass and stuff dies...alot. Quickly. Having block is nice too for when shit goes south.
Cleaver as secondary head taking option for when you head hunting. Steel blade, obsidian plate, slime rod. Full lapis (not really needed though) and an extra beheading for giggles and the rest quartz. Steel is cheap enough and durable enough, moss isnt really needed. Only taking it out for heads.