I would start by looking at:
- DJI F550 frame, start with stock motors and ESCs to keep cost within your budget,
- Naza V2 flight controller,
- Futaba 8FG or 8J, with either R6208SB receiver, or FrSky S-bus compatible receiver (http://www.alofthobbies.com/frsky-tfr4sb-fasst-sbus-receiver.html)...