Mineral concealer powder is the best for acne. Benefit's Bo-ing concealer is also amazing. You should choose a concealer that is lighter than your skin. These two are non-pore blocking and allows you to have natural application.
I have the same problem. I have heard the BEST reveiws from one at Walmart, that is by "Hard Candy" and it is called glamaflouge. Its only 6 bucks. I am going to try it, but appearently it is VERY good.