Some years ago I decided to build a quadcopter (back when DJI Quadcopters were really expensive and before the spark or mavic existed). The original plan involved the idea to build the chassis and electronics by when I heard about the RC-store ‘hobbyking’ and saw the prices, I decided to order some parts for testing first and might add or replace electronics later on. I went with a turnigy 9Xr remote with swappable modules (FrSky for now) and a multiwii controller.