A detailed specification list of the project needs to be written, but so far, have arrived at this much.

• 12V DC Geared Motors with Encoders for Differential Drive
  buying from China, AliExpress
• Lipo Battery, 14.8V 4S 2500mAH or more
  buying from China, AliExpress
  
• Motor Driver - MOSFET Based
  
• UltraSonic Sonar Sensor HC-SR04 for Range/Distance measurement
  min. 4, maybe 8 max. distributed on sides
• IR Proximity sensor - TCRT5000
  4 to 8 distributed on sides
• GY-9150 IMU Sensor
• NRF24L01+ Wireless Module
  
• Arduino Nano to read all the Sonar and IR sensors
• Arduino Mega as main Controller

A little WishList of things that would be good if implemented.

WishList

• ROS Drivers
• Raspberry Pi on board
  for WiFi, Bluetooth, Camera interfacing
• 3D Simulation Model, for V-Rep Software
• SLAM implementation
• Kinect Expansion, if Raspberry Pi is attached