Hello,
Welcome in the world of drones,there are many drones are available in $ 500 ,but as per your requirement that you want a high-quality camera.I"m suggesting you name of 3 or 4 drones.
DJI Phantom Aerial UAV Drone
Parrot AR Drone
Parrot Bebop
Parrot A.R. Drone 2.0 Power Edition Quadcopter...