#5" Apex Quad.
My first quadcopter build. I found a guy on eBay selling a lot of three 5" Apex frames, I grabbed it for £35 and went on from thier. I got the flight controller and most of the electronics from Ali Express. I got the motors and LiPos from the awesome HobbyRC store. I chose 4s for my first drone, in terms of power and operation 4s is fine. I think I should have gone 6s now, due to the lower amp draw when cruising.