***GEEK WARNING!!!***
Artificially intelligent nanotech cyberware with Spiderman 2 Doctor Octopus-style mechanical tentacles, fashioned of an alloy of adamantium and black mithril, that have the ability to assimilate, and/or transform/modify themselves into, a variety of weapons and tools. Most of the "weapon" would remain inside my body, enhancing my strength, speed, endurance, agility, etc., to superhuman, the rest, i.e., the tentacles, I would keep hidden beneath my long black coat until needed.
Otherwise, I'd like to have a kinetic chain gun, something akin in appearance to the Nerf Chain Gun, but black, of course, and modified so that in addition to being able to fire pulses of colored force and energy, it could also shoot Skittles...just so I could unload on someone and scream "TASTE THE RAINBOW, BI-YATCH!!"
Of course, there's nothing that says I can't have both....and a smartlink to boot.