Zinc Compounding, Steel Compounding, or...Chromium Compounding.
Zinc: Enhanced Intellect, Emotion Manipulation, Calculative Bullet Time...pretty awesome.
Steel: Quicksilver level speed, Steelpushes, Bullet Time...hehehe...Imagine the pranks...someone about to punch you, Compound Steel->shift into "Steel Time"->move hand of assailant->all the LULZ as your attacker tries to figure out how he ended up punching himself in the nuts...HAHAHAHA!!!
Chromium: Defense against allomancers, INFINITE LUCK...instant get rich plan...go to casino, compound Chromium, PROFIT...WOW.