I use the dx6i with 6210 rx on my 450 pro dfc with the 3Gx unit
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But you would not be able to use the governor in the 3Gx
As I said you need the 7th channel to control the governor mode, you can use the governor in the esc if you want,
If you have the 7 channels you use the satellites set up and no receiver so you get full function
Yes, you can use that Tx system to make it fly.
Clarification: The "BeastX" is a gyro that does NOT have an integrated receiver, Correct?
The AR7200BX is a gyro with an integrated receiver, Correct?
I agree with Jesse on this. Go as big as you can afford. The 500/550 class is a perfect start if you can afford the parts.
I would suggest you get extra parts at the beginning before you fly. This will ensure that you get back up right after a crash.
Good luck.