Which laptop should I buy for experimentation with drones?

Hello !
I wanted to a buy a laptop to play with drones. I will be using Ubuntu and ROS 16.04. After doing a short survey online I jotted down the following requirements for the laptop,

  1. Processor i7
  2. Integrated intel graphics
  3. RAM 16 GB
  4. Budget- $600-$700
    I needed some help and advice regarding this.
    Thank you !