It was actually his ^^ review of the Ares Armor that helped me make up my mind as far as a new compensator. I was dead set on the Surefire MB556K, but it was difficult to land one, and at a decent price.
Love the Ares though, it's done great since I've had it on. Allows for nice follow up shots, with minimal rise (and I still haven't "tuned" it yet), and it makes that 5.56/.223 sound like a monster when you fire it. So all in all, my first vote would be for the Effin-A, which will run you right around $100 and you can find them easily (or you used to when I got mine), or I would say go for the Surefire, but be prepared to drop anywhere from $135-$170 for it, depending where you look and if they have em in stock. Quite a few of my buddies that are security contractors swear by the Surefire, I plan on getting one eventually, I'm in no rush though because the Effin-A does the job just fine.