My .5 is using an Airtronics 359 servo. It's very fast at .10 sec, and has plenty of torque at 200 oz/in. And BTW, there's no such thing as too much torque when it comes to steering servos .
SH Z-Car, Custom Crawler, 8s Savage, 12s XTM XLB 1/7 buggy, 4wd 4-link rear/IFS Pro4 truck, Custom Hyper 10 Short Course, Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz