Segway is very amazing, however it was too expensive. Therefore I am gonna build a segway from skretch, check out my blog for daily update, I'am gonna post all my progress in a while. Below are the components that I had decided to use to build my own Segway.
Microcontroller: Arduino UNO 328
IMU: ADXRS613/ADXL203 single axis Gyro + dual axis Accelero
Motor Driver: 2x25A Sabertooth (a 24V 25A dual motor driver)
Battery: 24V5AHr Lithium Polymer Battery
Motor: 1 pair 24V 180Watt