Quick question about receivers and ESCs

Hi guys!

So I have a quick newbie question about receivers and ESCs. I am considering purchasing a pre-assembled copter which come pre-installed with a Spektrum receiver. While I would love to buy a Spektrum DX8 to go with the receiver, it's a bit out of my budget currently. I am looking at purchasing instead the Turnigy 9X which comes with its own receiver.

If I do this, is it a simple matter of switching out the receivers, or are some ESCs only compatible with specific receivers? And is there more to it than I realize?

Thanks!
 

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