Love the Carbotech pads. I currently run XP12 in the front and XP10 in the rear, on advice from Ken KNS Brakes in NC (great brake expert, specializes in Subarus).
Fronts just finished up after about 9 hard track days, and have worked excellent. Once the rears go I'll probably do XP12 front and back. The XP16 are a bit more rotor aggressive, and I haven't had any problems with the XP12s so I figure I'll save my Stoptech aerorotors since the fronts go for $500 a set haha