The Peacekeeper Blade (ToC) is very Engineer-like.
(If you don't want to fight the random nature of the drop and are Alliance you can buy Gnomeregan Bonechopper)
Many weapons from Ulduar also have very animated looks that you might find interesting.
I can't link, but look up Supposed Mace on Wowhead! Looks like a wooden wrench Vagaries of Time from the first boss in Dragon Soul looks like a cool spinning tool.