Robo Soccer

Hey, my team just won Robo Soccer using NXT and RobotC. I realized that the motors for NXT are too weak. So I am making an arduino to do the same program with similar robot structure. My robot has:

Compass Sensor
IR Seeker
4 motors
2 Ultrasonic Sensors

Are there any sensors or motors similar to this? I already found Ping))) for ultrasonic sensor. What is the best arduino for this project? What kind of wires or parts should I buy?