for around $70 I would get the Futaba S9451. Granted it is $10 more than you want to spend but it is a great servo! I just ordered 2!
You can get it here
www.servocity.com
Specs:
Control System: +Pulse Width Control 1520usec Neutral
Required Pulse: 3-5 Volt Peak to Peak Square Wave
Operating Voltage: 4.8-6.0 Volts
Operating Temperature Range: -20 to +60 Degree C
Operating Speed (4.8V): 0.13sec/60 degrees at no load
Operating Speed (6.0V): 0.10sec/60 degrees at no load
Stall Torque (4.8V): 97 oz/in. (7kg.cm)
Stall Torque (6.0V): 121 oz/in. (8.7kg.cm)
Operating Angle: 45 Deg. one side pulse traveling 400usec
360 Modifiable: Yes
Direction: Counter Clockwise/Pulse Traveling 1520-1900usec
Motor Type: Coreless Motor
Potentiometer Drive: Indirect Drive
Bearing Type: Dual Ball Bearings
Gear Type: All Metal Gears
Connector Wire Length: 12"
Dimensions: 1.6" x 0.8"x 1.5" (41 x 20 x 38mm)
Weight: 2.0oz. (56g)