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