This is the $64,000 question. I honestly believe most carbon arrows are pretty similar performance wise for the same money among all the different brands. I'm on a bow lease with two other guys, and we all shoot different brand arrows. I shoot Goldtip Pro Hunters and the others shoot Easton carbon injexion and carbon express maxima hunters. The only thing I have noticed during practice is that the carbon injexions do penetrate deeper. My bow is about 15 fps faster than the guy with the carbon injexions, and his arrows always penetrate deeper on the glendel target when we practice. I have had great luck with my pro hunters. They are very durable and very accurate.
Most people will tell you to buy whatever is on sale.