I want to create a High Powered Octocopter, with tons of technology in, what Microcontroller/Board do I use? ($7000 budget)

I'm developing a octocopter with tons of technology in it with high powered motors. (FPV, Parachute, Heavy Payload, Data Logging)

I need something I can program myself if I know C/C++. So what Microcontroller/Board do I use?

Guy told me to use a AtMega

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